Xiaomi S Pro 2026 vs TCL A400 PRO

When it comes to HDR quality, the Xiaomi S Pro 2026 is undoubtedly a very bright television. On our synthetic measurement patterns, we were able to generate peak brightness of around 1400 nits. This result is not only very good but truly spectacular, considering the price of this model. However, as we always emphasise, for our editorial team, measurements and the experiences from the content viewed on a daily basis - from films and series - are more important. So let's analyse how the Xiaomi performs with film material. The result is, unfortunately, quite mixed. When very bright scenes appear on screen, the S Pro 2026 really shows its full potential and can achieve a real 800-1000 nits in bright elements. Moreover, even smaller objects can "burn" the eyes - in scenes from the film Sicario 2, small metal elements of the helicopter were truly vivid. The problem is that - and here the story comes full circle back to our contrast assessment - in such scenes we cannot count on absolutely cinematic black. In our opinion, this compromise is too great; high visibility of details in bright areas should not come at the cost of such a significant boost to black levels. And although the HDR effect itself can make a stunning impression here, it is essential to remember that when very challenging, mixed scenes appear on screen, we might feel a slight disappointment. Exactly the one we mentioned in the previous paragraph regarding issues with dimming in HDR mode. As a consolation, it is worth adding that the S Pro 2026 has been equipped with an additional PFS filter (similar in function to a QLED layer), which effectively broadens the colour gamut coverage. As a result, measurements showed DCI-P3 coverage reaching up to 94%. This gives us confidence that in most colourful scenes, the image will appear rich and appropriately saturated.

The TCL A400 Pro is a moderately bright TV. Its peak brightness reaches around 600 nits. That level already allows for a real HDR effect, and in many films it does produce a noticeably more attractive picture than in SDR. However, it is not a level that overwhelms with sheer brightness. The A400 Pro therefore isn’t one of those TVs that ‘attack’ the viewer with a powerful flash in every eye-catching scene. The biggest limitation is seen with small bright elements on a dark background. Because of fairly aggressive local dimming control, the TV can significantly reduce their brightness, in extreme cases even to around 100 nits. This means that small lights, sparks, stars or individual highlights can be much less visible than they should be. It’s worth adding, however, that this isn’t without reason. The A400 Pro does this to maintain as deep a black level as possible and to limit the halo effect around bright objects. So it’s an intentional compromise: the TV more often opts for deeper blacks rather than maximally bright, point-like highlights. On one hand this can be understood, especially given the limited number of dimming zones, but on the other you should be aware that the HDR effect won’t always be as strong as the peak brightness alone might suggest.

On the plus side, the colours are a strength. The PFS LED filter used here, marketed by the manufacturer as QLED, allows for suitably saturated colours. Coverage of the DCI-P3 gamut measured around 94%, and BT.2020 around 74%, which is a solid result for this class.

Of course, all our measurements were carried out in "Film" mode, which is typically the best and most accurate choice we get straight out of the box. It needs to be said plainly: although it is the best mode, it is still very far from ideal. Firstly, the television has a clear tendency to impart a cool, bluish tint to the image – this is due to a poorly set white balance. Additionally, there is the issue of how the S Pro 2026 manages its brightness straight out of the box, which results in an overly vivid image. These two flaws contribute to truly significant colourimetric errors (Delta E). In HDR content, they were able to exceed our anticipated error scale of "10" by twofold (meaning values close to 20). As a reminder – the threshold for perceivable error by the human eye is a Delta E value of around 3. Results at the level of 20 indicate that the image significantly deviates from what the director intended.

As standard, we performed colour measurements in the best‑tuned Filmmaker Mode, the mode that is designed to be closest to the creators' intentions. The A400 Pro of course also offers other picture modes, but in practice these come with considerably larger colour errors and interfere more with the character of the image. Therefore we will not deal with them in detail in this part of the test. So how does the out‑of‑the‑box colour reproduction fare? In short: really very good. Actually, looking at our measurement results, downright excellent. Both the white balance and the luminance response were set surprisingly precisely. The errors were so small that during measurements we genuinely rubbed our eyes in amazement. Such good factory settings do not happen often, even in TVs operating in Filmmaker Mode. All the more credit is due to TCL, because the A400 Pro right out of the box can deliver an image very close to how the source material should look. The results were so good that one could easily think someone had already given this unit extra attention and tried to calibrate it.

Our nitpicking really comes down to just one thing. In SDR content the image was slightly brighter than the dark‑room reference intends, because the factory gamma was set closer to 2.3 than to 2.4. This is not a large error and most viewers will probably not even notice it.

It should, however, be noted that we are talking about our specific test sample. With factory colours there can always be some variation between units, production batches or screen sizes. We do not assume, therefore, that every A400 Pro will look identical straight out of the box.

So how does the S Pro 2026 perform after our calibration procedure? We have to admit that after calibration, the television becomes a really very pleasant device for watching everyday content. As you can see in the graphs, in HD (SDR) materials, both white balance and gamma values have been brought to nearly perfection. Most importantly, colourimetric errors have become practically unnoticeable to the human eye. In this scenario, the S Pro 2026 is simply an excellent television that, after professional calibration, can provide a lot of enjoyment from watching. However, it is worth clearly noting – our efforts have not helped much in 4K HDR mode. Despite the calibration, the television still interprets the image quite strongly "in its own way," which is clearly visible in the measurement of the EOTF curve (brightness tracking). It’s a bit of a shame, as it shows that the problem lies not in the panel itself, but in the software. Underdeveloped image management algorithms in HDR content can, unfortunately, rule out this television for many more discerning users.

Despite its superb factory calibration, we couldn't resist checking how the TCL A400 Pro would respond to professional calibration. Since the starting point was so good, we were all the more curious whether there was anything more to be had from the TV. And here we must boast: we managed to reduce our unit's colour errors to absurdly low levels. Measurements below a value of 1 are not something you see every day, even in very good TVs. Such results are more commonly associated with professional reference monitors than with a lifestyle TV for the living room. In terms of white balance and colour reproduction the A400 Pro therefore simply performed exceptionally well after calibration. The only gripe we have after closer analysis relates to the luminance behaviour. The TV adjusts luminance depending on the content being displayed and quite often the picture is slightly darker than the reference calls for. This is most likely due to the way the Mini-LED backlight and local dimming algorithms operate in this model. However, this does not spoil the overall impression, because in terms of colour accuracy alone the calibrated A400 Pro showed a level that was really hard to expect.

Let's start with the issue we raised in the previous paragraph: can the television actually fix the problem of dreadful tonal transitions in dark scenes? Theoretically, yes – in the menu, we find a feature with the promising name "Colour Contour Removal." Well, "theoretically." Unfortunately, in practice, this setting – regardless of which of the three power levels is chosen – yielded absolutely no real results. So we are dealing with a feature that, in practice, only exists in the menu. Moving on to the quality of upscaling (scaling the image from a lower resolution to 4K), unfortunately, we have more bad news for you. The S Pro 2026 performs very poorly at this task. Interestingly, the phenomenon of "overscan" (slight cropping of the image) is not a major issue here. The fact is that the television simply displays a very raw, unprocessed image. Its attempt to upscale the signal to a higher resolution looks simply lacklustre and lacks any form of "intelligent" improvement. There is no denying it – the entire digital image processing is the real Achilles' heel of this model.

Digital image processing is, unfortunately, one of the weaker points of the TCL A400 Pro. That does not mean the TV performs badly, but it is hard to call it anything clearly above average. The upscaling itself is adequate: edges are smoothed fairly well, the picture does not look overly sharp or "pixelated", and lower-quality content can be watched without much discomfort. At the same time, the overall image is slightly soft and lacks the precision offered by the best image processors in more expensive TVs.

Much worse, however, is how it handles tonal transitions caused by strong signal compression. TCL has equipped the A400 Pro with a "Gradual Smoothing" feature that, in theory, should limit visible colour banding and artifacts in lower-quality material. In practice, though, its effectiveness is very limited. It does not improve tonal transitions in any noticeable way, and at higher settings it can also smooth out image details, giving the picture an artificial, slightly blurred character. For that reason, we think it is best to leave this feature off. The A400 Pro copes decently with basic image scaling, but if you often watch heavily compressed content with noticeable posterisation, this model will not be among the best choices.

On paper, the S Pro 2026 specification looks impressive. The television is equipped with a native 144 Hz panel, with the ability to display images at up to 288 Hz in a dedicated gaming mode. These are amazing results, but what interested us most, in the context of everyday use, was how the television handles motion blur and how the image looks at 120 Hz. After all, this is the frequency used by consoles like the PlayStation 5 and Xbox Series X/S, and it is desired by sports fans. Generally, the panel "holds up". The matrix is sufficiently fast to meet these challenges, and objects displayed at native 120Hz fluidity are shown correctly. As for the software, the television is equipped with motion smoothing technology; however, with a key caveat – it works only for input signals up to 60 Hz. This means it is primarily suitable for traditional television, films, and series. Thanks to this, we can adjust the fluidity of the image to our own preferences – from a very smooth, "theatrical" approach to setting the slider to "zero" and maintaining a fully cinematic character.

The TCL A400 Pro is equipped with a 144 Hz panel, but in practice we are most interested in its behaviour at 120 Hz. That is the frequency most consoles are limited to today, as well as many sports broadcasts and high-frame-rate content. At that rate the TV performs quite well. The sharpness of moving objects is really good, especially after properly configuring the motion smoothing. The "Motion Clarity" function is responsible for improving smoothness. Its settings include two sliders that let you tailor how the motion smoothing operates to your preferences, separately for lower and higher frame-rate material. This makes it possible to achieve both a more cinematic look and a noticeably smoother picture. Those who do not want to fiddle with manual configuration can use presets such as low, medium, high, cinema or nature.

For gamers, the Xiaomi S Pro 2026 is almost an ideal proposition on paper. It is equipped with two HDMI 2.1 ports, which allow us to unlock (although these options are somewhat hidden in the menu) the full package of features: ALLM, VRR and, crucially, the ability to work in 4K at 144 Hz. This last feature should particularly please the owners of powerful PCs. The television also has something resembling a gamer panel – and although it's hard to call it a fully-fledged "Gamebar", it serves its purpose by displaying key information. It’s just a shame that in its default form, it obscures a relatively large portion of the screen.

The biggest issue we have with this model, however, concerns how the S Pro 2026 handles games in HDR mode. To put it bluntly: it doesn’t handle it well at all. Due to the television having a poorly implemented HGiG feature (the HDR tone mapping standard for games), it is very easy to "overexpose" the image during initial HDR calibration on the console. If someone is unaware of this software flaw and follows the on-screen instructions, they will simply set the image incorrectly, resulting in burnt-out details in the bright areas. Another major problem is the Dolby Vision mode for games. While it does work, it generates such a high input lag that it becomes noticeable in dynamic titles. (You can check all our lag measurements in the paragraph below). In summary: Generally speaking, this is a really very good screen for gamers, but with one small caveat. We would rather avoid using HDR mode on it – unless we decide to manually set the brightness bar on the console "by eye", completely ignoring the instructions from the console’s pictogram.

In terms of features for gamers the TCL A400 Pro performs brilliantly. The TV has practically everything you can expect from a gaming TV today: support for 4K at high refresh rates, VRR, ALLM, correct implementation of HDR formats in games including Dolby Vision, and HGiG. That means it works well with both next-generation consoles and a PC. Another plus is the presence of the Game Bar, a special panel with the most important settings for gamers. From it you can quickly check basic information about the signal, refresh rate or active features, and also adjust the appearance and behaviour of some settings to suit your preferences. This solution may not change picture quality by itself, but it greatly improves the convenience of using the TV while gaming.

The only thing to complain about is the number of full HDMI 2.1 ports. The A400 Pro has only two such connectors out of the four available, and one of them also serves as eARC. In practice this means that if someone wants to connect two next-generation consoles and a soundbar, they may run into some limitations. In that scenario you will have to either swap devices or use additional equipment, such as an AV receiver or a soundbar with HDMI inputs. Even so, it is hard not to rate the A400 Pro very highly as a TV for gamers. The gaming feature set here is truly powerful.