TCL C855 vs Sony BRAVIA 2 II (S25M2)

TCL C855 delivers a highly varied HDR effect. On one hand, the television truly shines, while on the other, it resembles a lower model with FALD backlighting. This situation is, however, regularly observed in this brand, so it was not a surprise to us. The first and last scenes, featuring large elements of light, look almost phenomenal, "shining" with brightness levels of 1470 and 1820 nits respectively. Such effects will certainly cause more than one person to squint, while simultaneously feeling the extraordinary dynamism of the scene itself. You can truly feel as if you are inside the film. The situation changes dramatically when small or minor elements with high luminance surrounded by black appear on the screen. The TCL C855, in order to avoid the halo effect, significantly reduces brightness to a level of even 240 nits, which is a disappointing result, causing the film to not appear as if it was recorded in HDR. The HDR effect in the TCL C855 makes watching dynamic scenes more engaging, allowing the viewer to feel as though they are part of the action. Even with smaller elements of high luminance, the television manages to maintain details without excessive dimming. Moreover, the TCL C855 test shows that the brightness of the image is adjusted for scenes with a large amount of detail, which enhances viewing comfort.

The Sony Bravia 2 II is not a very bright TV and unfortunately that is immediately apparent in HDR. In our measurements brightness stayed around 300 to 330 nits, which is clearly too low for the brightest parts of the image to look truly impressive. In practice, HDR here does not differ that much from standard SDR. Bright highlights, the sun or lamps are of course visible, but they lack the intensity you would expect from HDR material. The Bravia 2 II therefore performs much better with standard SDR content, and in that use its limited brightness will be least noticeable.

Colour gamut coverage

The Sony Bravia 2 II is also not impressive in terms of colour. The TV does not use any additional gamut‑expanding filter, such as the quantum dots found in QLED TVs or a PFS phosphor layer. In our measurements coverage of the DCI‑P3 gamut was about 78%, and the very wide BT.2020 roughly 57%. That's definitely too little to talk about truly saturated colours in HDR material. More intense reds, greens or turquoises will simply be less striking than on TVs with an expanded colour gamut. The Bravia 2 II therefore performs much better in the Rec.709 standard, the gamut used for films, series and television in SDR.

The best factory mode for the TCL C855 is "Film," and it is on this mode that we conducted all our tests. Like any mode predefined by the manufacturer, it had its drawbacks that are worth correcting to achieve an image as close as possible to what the film producer intended. We will examine the colour characteristics in both SDR and HDR materials. Looking at the first, we see a noticeable dominance of green in the white balance, which, as you might imagine, resulted in an unpleasant greenish tint across the entire image. Observing the very important gamma chart, which is responsible for the image's contrast, we see a significant deviation from the reference line marked at 2.4. From the left, we can observe a strong spike in the measured value, which at this point caused the image to be overly contrasted, merging details into a dark blob. This situation persisted for quite some time, up to 20% of the chart's value, before then dipping below the reference. This, in turn, meant a brightening of the image and a significant drop in contrast. The factory mode performed slightly better in HDR materials, as the white balance looked quite good, except for the second half, where green once again took precedence. Looking at the EOTF curve, which, unlike gamma, shows the rate of brightness increase, we see primarily two errors: the darkest scenes were too dark, and the brightest ones were overexposed. This was something we could also observe in the scene from the film "Pan" in the paragraph checking the TV's HDR.

The out-of-the-box colour reproduction in Cinema mode was actually quite good, at least for ordinary SDR material. The Bravia 2 II had a slight tendency to boost reds, so some colours shifted to slightly warmer, at times faintly pinkish, tones. However, this wasn’t a major fault and during normal viewing the picture still looked fairly natural. There was a bit more happening with image brightness. Looking at the gamma curve, you can see Sony doesn’t stick perfectly to the reference value. The darkest areas are slightly lifted, while as brightness increases the gamma gradually rises and a larger part of the picture becomes darker than it should. That said, it’s not such a large difference as to be very distracting in everyday viewing. Overall, SDR straight out of the box performs quite respectably.

The situation is considerably worse in HDR. We’ve already mentioned the limited colour gamut, but in addition the Bravia 2 II noticeably manipulates image brightness here. The EOTF curve sits below the reference value for a large part of its range, which means the TV renders most mid and brighter parts of a scene darker than the source material intends. Only towards the very end of the range does the curve flatten out, as the panel reaches the limits of its capabilities. Combined with a peak brightness of around 300 nits, this results in HDR that not only lacks much brightness, but can also simply look too dark.

TCL, like the vast majority of manufacturers, provides advanced calibration tools in its televisions. Here we find 2- and 20-point adjustments for greyscale as well as an advanced colour management system. The results, as you can see, are very good, and in SDR materials we have significantly approached the reference image. We eliminated both the green tint and the gamma issue, although there is still a slight "kink" at the very beginning. The performance with HDR materials was somewhat poorer, as the TCL C855 did not allow us to model them adequately. We were only able to slightly adjust the EOTF curve and significantly improve the colours themselves.

Calibration did a lot for the Bravia 2 II, particularly with SDR content. Above all, we managed to even out the white balance and tidy up the gamma, which now follows the reference value much more closely. As a result, the image no longer has the previous pink cast, and the brightness across different areas is much better organised. You can also see this in the colour errors, which after calibration fell to a very low level (with slight issues in the most saturated reds). We also partially managed to rein in the Bravia 2 II in HDR, especially in the way the television handles image brightness. However, there is one thing no calibration can fix: the capabilities of the panel itself. A narrow colour gamut means the television is physically unable to reproduce the most saturated colours present in HDR material. On top of that, the low contrast of the IPS panel means darker scenes are veiled by a grey haze, which robs colours of some of their depth. So we can improve how the Bravia 2 II makes use of its capabilities, but unfortunately we cannot overcome the panel's inherent limitations.

Once again, we will take a look at the function of smoothing tonal transitions, but this time also at image scaling. The latter is particularly important when watching lower-quality materials, such as certain television programmes or older films. We will focus on the function responsible for tonal transitions. Interestingly, just like in the scenes of the previous test, it performed excellently and smoothed out practically all the inconsistencies; however, here it had problems. Using the menu responsible for this function, we found that no setting - even the strongest - was of any help.

Image scaling in TCL C855 is described as one of the best we have had the opportunity to test so far. The image is sharp, but in a way that could be described as natural for our eyes. Even the small, fine branches do not have jagged edges, and there is no white halo around figures, which is characteristic of inferior scaling systems.

The upscaling on the Bravii 2 II is quite good and, in that respect, the TV matches the standard Sony has set. Lower-resolution content is sensibly upscaled to 4K, and the image is slightly smoothed in the process without excessive edge sharpening. The situation is worse when it comes to improving footage with visible compression artefacts. This is handled by the "Digital Noise Reduction" function, which at the "High" setting can indeed smooth out some unpleasant tonal banding. The problem is that it does this rather aggressively and, along with the imperfections, it also removes a lot of fine detail, including natural film grain. What is more, when there is more motion on screen its effectiveness drops sharply and any improvement is then minimal. For everyday use we therefore tended not to use this function.

The maximum refresh rate we can set on the TCL C855 is 144 Hz. Naturally, this is only possible by connecting the TCL C855 television to a very powerful PC. Otherwise, we will be operating at a maximum refresh rate of 120 Hz, which is recommended if we primarily want to watch sports or content with a lot of motion dynamics. For those requiring high image fluidity, the manufacturer has implemented a multi-stage motion smoother. This has been divided into two separate sliders regulating the sharpness of moving images (Motion Blur Reduction) and flicker (Flicker Reduction). Both sliders can be set in the range from 0 to 10, with each increment affecting the level of smoothing, so everyone can find their sweet spot. We present a setting that allows for slight smoothing without the soap opera effect.

The panel of the TCL C855 features a very good response time. This is particularly important as VA panels often have issues with so-called ghosting, which is the effect where a black halo can be seen behind a fast-moving object.

Bravia 2 II uses a 60 Hz panel and, given its capabilities, handles motion quite well. However, bear in mind that it is a basic panel and its limitations are already clearly visible, especially during sports. The TV cannot interpolate 50/60 fps material to a higher refresh rate, so it cannot further improve the sharpness of fast-moving objects. For films and series, however, it offers a conventional motion smoothing feature that can reduce the characteristic judder of material shot at 24 fps.

The TCL C855 television is equipped with full HDMI 2.1 connectors with a full bandwidth of 48 Gb/s. During our tests, we confirmed the seamless operation of all functions that are part of this standard. As can be seen, all checkboxes light up green, which will certainly be appreciated by gamers, both console and those using the television as a monitor for their computer. Additionally, the TCL C855 supports both AMD FreeSync and NVIDIA's G-Sync, which can be easily activated in the graphics card settings. Those with a very powerful setup can send a 144 Hz signal to the C855, which this television handles effortlessly. It is also worth mentioning the implementation of the HGIG mode, which, however, due to the flaw of the “Game” mode, is overly brightened, making it difficult to configure properly on screen. Fortunately, the television performs excellently with the Dolby Vision format.

The TCL C855 is one of the first manufacturers to equip its televisions with a special GameBar, which allows for extensive setting changes on the fly, without the need to exit the game. It features functions such as an additional crosshair grid, black level correction, and settings for people with disabilities. In the picture, we can see the next generation of this solution.

In summary, the TCL C855 television will be an ideal solution for those seeking a screen for all sorts of electronic gaming. Thanks to all the features supporting such entertainment, it is incredibly engaging. It is also important to highlight the very low input lag, regardless of the selected settings, including with the HDR Dolby Vision format.

The Bravia 2 II is not a television that lends itself well to gaming, and the list of features shows that quite quickly. You essentially only get the automatic low-latency mode ALLM and a simple Game Bar that lets you view basic signal information and change a few settings. But that is where the list of strengths ends. The TV does not support VRR or 120 Hz (not even at lower resolutions), and on top of that it has problems with a proper implementation of the HDR HGIG format. It is suitable for occasional console gaming, and thanks to low input lag controls remain responsive, but if someone is looking for a TV primarily for games, the Bravia 2 II will simply be a rather limited choice.