Samsung QN900F vs TCL C6KS / C69KS / Q6CS

QN900F is truly a bright television – it can generate nearly 2000 nits, a figure that remains unattainable for most models available on the market. But the mere ability to achieve such brightness is not everything – it also matters whether the television can make good use of it. And here, it is not always perfect. Our tests on cinematic test patterns showed that in scenes such as those from Life of Pi or The Meg, the QN900F can truly shine – literally and metaphorically. In such moments, its greatest advantage, which is brightness, makes a huge impression. However, in more demanding scenes, challenges arise – similar to when assessing contrast. When smaller, bright elements appear on screen, the television often struggles with the decision: should it highlight them at the expense of black levels, or perhaps maintain deep blacks while toning down brightness. The result is situations where, for example, in the film Sicario 2, brightness dropped to just 200 nits, making details barely visible. Dimming algorithms could definitely be better for a television of this class.

And what about HDR? Here, the C6KS performs quite well and – as has become a recurring theme of this review – identically to the C6K model. The maximum brightness generated by this television is around 600 nits. In bright scenes, this translates to a really solid, cinematic effect, and generally, the video materials look good here. However, one must keep in mind the specifics of the dimming algorithm in this model. When very small, bright points (e.g., stars) appear against a dark background, the television can dim them quite significantly. The goal is simple: to eliminate blooming and maintain the best possible blacks. This is quite a reasonable compromise. Most viewers will definitely appreciate deep, "true black" more than additional micro-details, the display of which could cause the screen to appear greyed out. This is the nature of local dimming technology in this price range, and one must be aware of it. It is also worth noting that the TCL C69KS (C6KS) has an additional PFS coating, which is marketed under the slogan of QLED technology. Thanks to this, the colours are saturated and vibrant – our measurements showed that the coverage of a wide colour gamut reaches as much as 92% here.

Testing the QN900F in Filmmaker mode, the characteristic features of the image were quickly noticeable, even though this mode is designed to reflect the director’s vision. The white balance was not perfect – the television displayed distinct deficiencies in the blue colour. This made the entire scene take on a warmer tone, as if someone had applied a subtle filter in shades of yellow and orange. In films where bright shots dominate – for example, scenes in the snow or in strong daylight – this gave the impression of slight warmth that did not always convey the director's intent. The second noticeable element was the management of brightness. The QN900F could sometimes brighten the image more than necessary. It looked as though the exposure had been slightly 'pulled up', causing the scene to lose its naturalness. Shadows were sometimes too shallow, and the contrast slightly weakened. These are not disqualifying errors, but for a television in this price range, it is evident that Filmmaker mode has not been perfected one hundred percent. This is particularly noticeable when we compare its image with what was seen after the screen calibration.

Unlike the more expensive C6K model, the tested C6KS does not have an option in the menu labelled as Filmmaker Mode. Is this a reason to cry? Absolutely not. Our tests have shown that in practice, in terms of colour reproduction, the lack of this specific label makes virtually no difference. The best available Film/Cinema mode here offers an almost identical picture characteristic to the aforementioned Filmmaker in the more expensive model. So we get a very similar image, just under a different name. Therefore, if you were wondering whether paying extra for the C6K gives you better colours – the answer is no, in both cases the base is the same and requires slight adjustments.

After calibration, we managed to eliminate errors in white balance and adjust them to a level that can be considered acceptable. It is not perfect, but it is definitely better than the factory settings. Most colour errors now lie within the deltaE 2–3 range, so in practice, they should not be noticeable during everyday viewing. However, the most significant improvement is evident in how the television manages brightness in SDR content. Shadows and details are no longer flattened, which gives the image depth and naturalness. As for 4K HDR material – colours themselves are no longer an issue, but some imperfections of Mini-LED technology can still be observed. The QN900F tends to dim the smallest bright elements too much, causing them to sometimes disappear from view. However, it should be noted that this is a much better solution than boosting the entire screen, which would spoil the contrast. This is more of a characteristic of this technology than a typical flaw, but it is worth keeping in mind. The effects of calibration are truly very good.

Thanks to the white balance adjustment, the C69KS's tendency to distort colours has been effectively limited, resulting in a very good final effect. After calibration, we will no longer see excessive warming of scenes in SDR or overly cool tones in HDR. However, it is worth noting the brightness characteristics. In SDR content, it is hard to have any objections – the image looks very good, especially in older films, television programmes, or materials from YouTube. It is significantly more challenging to evaluate the television's performance in HDR. Analysis of the EOTF curve suggests correct behaviour, but its practical variant reveals certain limitations. The C69KS can overly brighten the smallest elements of the frame, while at other times, it can dim the entire scene. Thus, calibration brought clear benefits in terms of colour quality, but certain limitations resulting from the local dimming operation and the way it is controlled by the C69KS cannot be overlooked, as we also saw in the C6K test.

If we want to eliminate jarring tonal transitions that can be irritating, for example, while watching YouTube, we can use a feature called noise reduction. It works really effectively – it removes issues with colour blending when we set it to Standard level. However, as with most Samsung televisions, this does involve some compromises. Although we did not notice this feature significantly affecting the structure of objects in the image, it unfortunately reacts quite aggressively to film grain. Most people will likely appreciate this effect – the noise is simply removed – but if someone is looking for an image as close as possible to reference settings, we definitely recommend turning this option off.

When it comes to scaling, or dealing with very low-quality content, the QN900F performs really well. On the test card with the model, the image appeared clear, with only slight aliasing that shouldn't bother most viewers. However, it is worth mentioning one issue – the television sometimes has problems with so-called overscan, which can cause older content to be slightly cropped. This might manifest, for example, in subtitles disappearing from the bottom of the screen.

The C69KS handles upscaling quite well. The tested 576p material looks surprisingly decent – a considerable amount of detail is retained, and the algorithm adds a slight "rounding" effect to sharp edges, making the image appear more cohesive. The performance in smoothing tonal transitions is less impressive. The television practically cannot improve them, leaving the image in a rather raw state. With older material, this can be quite tiring, as the lack of additional processing highlights any imperfections.

There really is nothing to complain about here – the QN900F looks very good in terms of motion. With a 165 Hz panel in 4K, it can confidently be said that this television is suitable for both watching sports and gaming. The motion enhancer plays a key role here. It works brilliantly – not only during sports broadcasts, where it can eliminate blurring and image shaking, but also in games, where the animation becomes clearer and smoother. And of course, if someone likes to experiment with films – they also have that option. At lower settings, a slight graininess and cinematic character can be seen, while at higher settings, it takes on a soap opera effect. In other words, everyone can adjust the picture to their preferences, and the television has the power to handle it.

C69KS offers a simplified motion enhancement panel in films, allowing the adjustment of effect intensity with a slider. This makes it easy to match fluidity to personal preferences. The ability to use higher refresh rates is also a plus – although the panel operates natively at 4K at 60 Hz, lowering the resolution to 1440p enables 120 and 144 Hz modes, both on consoles and PC. This sounds like great news, however, in practice, the image at these settings exhibits significant motion blur. The effect is so pronounced that the overall presentation appears merely average and loses its appeal for everyday use.

It really is nice here. The QN900F offers a full set of features that we would expect from a top-end gaming television – we have VRR, ALLM, Game Bar, and also cloud gaming applications. However, the biggest standout is the proprietary motion smoother, which also works in games and – importantly – does not introduce noticeable lag. This is something we won't find with its other competitors.

Unfortunately, there is also something concerning. This year, Samsung has evidently messed something up with its televisions. During the testing of the QN900F before its update, it had the HGIG feature, which allowed for perfect adjustment of HDR settings for the console. However, according to our procedures, we always update the equipment to the latest version – in order to give the manufacturer a chance to fix any shortcomings. And here… it turned out the opposite.

After the update, the HGIG feature disappeared from the menu, making the correct configuration of the console for HDR practically impossible. It was supposed to be complete – 165Hz, four HDMI 2.1 ports, a full gaming package… but unfortunately, it turned out to be a small blunder. What a shame.

If we overlook the smudging and lack of native 4K at 120 Hz, the C69KS impresses with how well it performs during gaming. We get everything one can expect from a gaming television: variable refresh rate (VRR), automatic switching to game mode (ALLM), Dolby Vision Gaming mode, and a well-functioning HGiG. The television can also operate at 120 and even 144 Hz at lower resolutions, allowing for smoother gameplay on a console or PC. Additionally, there is a clear Game Bar that lets you quickly glance at key settings while gaming. As a result — despite a few limitations — the C69KS can be a really successful screen for gamers.