TCL C855 vs Hisense U7Q

The TCL C855 delivers a highly varied HDR effect. At times, the television truly excels, while at other moments, it appears reminiscent of a low-end model equipped with FALD backlighting. Inconsistency is frequently found with this brand, so it didn’t come as a surprise. The first and last scenes, which feature large light elements, are nothing short of spectacular, boasting brightness levels of 1470 and 1820 nits, respectively. Such brightness can make viewers squint their eyes, allowing them to feel the extraordinary dynamism of the scene. It genuinely immerses the audience, creating a sensation of being inside the movie itself. However, the situation shifts dramatically when small or subtle elements with high luminance appear against a dark background. In these instances, the TCL C855 significantly reduces brightness to levels as low as 240 nits to mitigate halo effects. This reduction is disappointing, as it can make the movie appear as if it was not filmed in HDR. Despite these shortcomings, the HDR effect on the TCL C855 enhances the viewing experience during dynamic scenes, making it feel more engaging and allowing the viewer to feel part of the action. Even with smaller high-luminance elements, the television retains details without excessive dimming. Additionally, the TCL C855 adjusts image brightness according to scenes with rich detail, further enhancing viewing comfort.

Since the algorithms responsible for blacks are performing quite well, we expected a similarly good effect when it comes to brightness and overall HDR quality. Unfortunately – here we have to disappoint you a bit.

The U7Q is quite a bright TV – in optimal conditions, it can reach around 800 nits, which indeed impresses on some screens, especially in scenes like those from the movie The Meg. Bright segments can really shine, and the HDR effect is noticeable. The problem arises when very small, bright elements appear on a dark background – for example, in Sicario 2 or in the second scene of the movie Life of Pi. In such moments, the dimming algorithms operate too aggressively. Yes, the blacks look great then, but the brightest points can almost completely fade, causing the HDR effect to disappear and details to be barely visible. That's just the nature of this technology in this price segment.

As a consolation, it's worth adding that the U7Q is advertised as a QLED TV (in practice, a PFS layer is used, which works very similarly), and it is indeed capable of displaying a wide color palette – with DCI-P3 coverage at around 94%, that's a very good result for this class.

The best factory mode for the TCL C855 is the "Film" setting, and all our tests were conducted using this mode. However, like many predefined modes, it has flaws that should be addressed to achieve an image closer to the producer's original vision. In our examination of the colour characteristics for both SDR and HDR materials, issues were found.

Focusing first on SDR content, there is a noticeable dominance of green in the white balance, which leads to an unpleasant greenish tint across the entire image. The gamma chart, crucial for image contrast, shows a significant deviation from the reference line marked at 2.4. Initially, there is a pronounced spike in the measured value, resulting in an over-contrasted image where details can merge into a dark blob. This condition persists for nearly 20% of the chart before it dips below the reference line, causing the image to brighten and resulting in a substantial drop in contrast.

In HDR materials, the factory mode performs somewhat better; the white balance appears more balanced overall, although the green tint resurfaces in the latter half of the spectrum. When we look at the Electro-Optical Transfer Function (EOTF) curve—unlike gamma, which reflects contrast—we identify two main errors: the darkest scenes are too dark, while the brightest ones become overexposed. This discrepancy was evident in our review of the scene from the movie "Pan," further illustrating the TCL C855's HDR performance issues.

We tested the U7Q in the best possible picture mode, which is Filmmaker Mode. This mode is supposed to provide the most "filmic" experience and fidelity to the creators' intent – right out of the box. Unfortunately, even this professionally sounding name does not guarantee a perfect picture.

In our unit, the problem lay in a poorly set white balance. Both in HD and 4K content, the image had too much blue and red, giving the screen a slightly pinkish hue. It didn't look terrible, but it was noticeable – especially in bright scenes and white backgrounds. This alone could have been forgiven, but the biggest issue is the management of brightness in HDR content. The EOTF curve from the measurements confirms what we saw earlier during the scene tests: the television often dims the smallest bright elements too much, causing them to almost disappear, or conversely – excessively brightens the brightest ones, affecting the naturalness of the image.

TCL, like most manufacturers, offers advanced calibration tools within its televisions. These include both 2-point and 20-point adjustments for grayscale, as well as a comprehensive colour management system. As a result, we achieved impressive results in SDR materials, bringing the image significantly closer to the reference standard. We successfully eliminated both the green tint and the gamma issue, although a slight "kink" at the very beginning of the gamma curve still persists.

In contrast, the situation with HDR materials was less favourable, as the TCL C855 did not allow for precise modelling. We were only able to make minor adjustments to the EOTF curve while significantly enhancing the overall colour accuracy. This limitation suggests that while calibration tools are effective, they may require further refinement for optimal HDR performance.

Thanks to specialized tools, we managed to correct the color quality in SDR content to nearly perfection. In materials with lower dynamics, delta E errors dropped below 0.5, which can be considered an almost reference result. The image on television, YouTube, or classic Full HD looks really good after calibration. Well, but where couldn’t we improve the image so easily? Primarily, it concerns HDR quality content. While we managed to somewhat "tame" the white balance and eliminate pink hues in most scenes, unfortunately, we did not have full control over brightness management. We set the local dimming settings according to the best observations – SDR: Medium, HDR: High – but the U7Q still did everything a bit its own way. There were still cases of overly strong dimming or brightening of details that the calibration simply couldn't eliminate. And although the overall reception of the content is much better, it must be taken into account that the U7Q will always have something to say at the end "but."

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

Image scaling in TCL C855 is defined 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 to our eye. Even small, fine branches do not have jagged edges, and there is no white halo around figures, a characteristic of weaker scaling systems.

There are situations where we would like to smooth out tonal transitions a bit, especially in older materials – those that have limited source quality. The U7Q is equipped with a feature called “Smooth and Gradient Image,” but unfortunately… it works very poorly. In the “Low” option, the effects are practically unnoticeable, and other settings smooth out details but do not improve tonal transitions. The only plus is that the feature does not interfere with film grain, so it does not ruin the natural structure of the image.

Fortunately, content scaling performs quite well. The image is not overly sharpened, there is no artificial clarity – and although it is known that this is not the level of high-end televisions, the U7Q handles displaying really old content in a completely acceptable manner without any problem.

The maximum refresh rate you can set on the TCL C855 is 144 Hz. Naturally, this is only possible after connecting the TCL C855 TV to a very powerful PC. Otherwise, we will be operating at a maximum refresh rate of 120 Hz, which is recommended if we want to watch primarily sports or materials with a lot of motion dynamics. For those who require high image fluidity, the manufacturer has implemented a multi-stage motion smoother. It is divided into two separate sliders which control the sharpness of moving images (Motion Blur Reduction) and flicker (Flicker Reduction). Both sliders can be adjusted from 0 to 10, with each level affecting the degree of fluidity, so everyone can find their sweet spot. We present a setting that allows for slight smoothing without the soap opera effect. The matrix of the TCL C855 features a very good response time. This is particularly important since VA panels often struggle with the so-called ghosting effect, where a black halo can be observed behind a fast-moving object. where a black halo can be observed behind a fast-moving object.

U7Q is truly a fast television, similar to its more powerful version "PRO". At a resolution of 4K, it supports up to 144 Hz refresh rate, and if someone wants even more – in Full HD you can achieve up to 240 Hz! This will mainly benefit PC gamers, but it’s worth appreciating – this is a rare feature in this price segment. Right from the start, it’s clear that U7Q was created with dynamic content in mind, such as games or sports. In films, we are not left "out in the cold" either – U7Q offers the "Ultra Motion Smoothness" feature, where using two sliders you can adjust whether you want a smoother, theatrical image, or something closer to a cinematic style with a visible frame. It’s good that, like with most manufacturers, we have a choice here and can adjust it to our own preferences.

The TCL C855 TV has fully-featured HDMI 2.1 ports, boasting a full bandwidth of 48 Gb/s. During our testing, we confirmed the seamless operation of all functions included in this connection standard. As highlighted, all checkboxes are illuminated in green, a feature that will undoubtedly be appreciated by gamers, whether on consoles or those using the TV as a computer monitor. 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 powerful configurations can feed a 144 Hz signal to the C855, which handles this effortlessly. It is also worth noting the implementation of the HGIG mode, which can be excessively bright due to the shortcomings of the "Game" mode, making proper configuration on the screen challenging. Fortunately, the TV excels with the Dolby Vision format.

TCL, as one of the pioneering manufacturers, has equipped its televisions with a special GameBar, allowing for extensive adjustment of settings "on the fly" without the need to exit the game. This feature includes options like an additional crosshair grid, black level correction, and settings designed for individuals with disabilities. The image showcases the next generation of this solution.

In summary, the TCL C855 TV is an ideal choice for those seeking a screen for all forms of electronic gaming. With comprehensive features supporting such entertainment, it provides an extremely engaging experience. It is also important to emphasise that it maintains very low input lag, regardless of the selected settings, including when using the Dolby Vision HDR format.

The Hisense U7Q is a TV designed for gamers – and you can see that right away based on its gaming capabilities. It has practically everything you could wish for: variable refresh rate (VRR) – check, automatic game mode (ALLM) – also check, and high refresh rates of up to 240 Hz in Full HD, as well as support for various resolutions, not just 4K. It's truly a great set of features that makes the U7Q excel in both fast-paced shooters on consoles and more demanding titles on PC. Of course – like in most Hisense models – it lacks a proper implementation of the HGiG function. That's a shame because HGiG allows you to adjust the brightness of the console to the specific TV, which in practice makes displaying HDR games according to the creators' intentions much easier. Without this, you simply have to reckon with certain limitations in the final HDR image in games.