LG OLED C4 vs Hisense U7S Pro

The results of HDR materials are definitely among the better ones. Practically every film significantly exceeds the 700 nits barrier, allowing for a very realistic image. Of course, none of them surpasses the magical thousand, yet the combination of such results and unlimited contrast and black effectively boosts the outcome optically. The last of the scenes, featuring a full-screen burst of sunlight, is actually less bright than the others, although it still represents a commendable level. It is also worth mentioning the excellent coverage of the DCI-P3 colour palette, which will allow for achieving extremely vivid colours.

Let's start with the fact that the U7S Pro is an impressively bright television – in calibrated mode, our measuring equipment indicated a staggering 2200 nits of peak brightness! This is an absolutely remarkable result, considering that this model is positioned rather as a mid-range option.

However, as we know, peak brightness on test patterns is one thing, and actual film scenes are another. Unfortunately, in real video materials, the backlight power clearly drops. Although in the most demanding moments, the television can still exceed the 1000-nit barrier – which is still an excellent result, perfectly aligned with the mastering standards of most HDR films – the real challenge comes from the aggressively tuned local dimming algorithms. Because of this, small, bright details such as stars or the moon in the night sky are noticeably dimmed. The television tries at all costs to maintain deep blacks, which is of course understandable, but unfortunately, this comes at the expense of the dynamics and brilliance of the HDR effect itself.

One must commend the colour reproduction. The new U7S Pro is a QLED design that provides very wide coverage of the colour palette. Unlike last year's model (U7Q Pro), this year's variant is a "true" QLED, rather than a solution based on a PFS filter. As a result, the colour saturation has clearly increased, and coverage of the most demanding BT.2020 colour space has surpassed the 81% barrier.

The best factory mode implemented in the tested television was "Filmmaker". It was this mode that we used during all tests. This mode proved to be quite good in terms of colour reproduction; however, other shortcomings effectively detracted from the enjoyment of viewing. Starting with the most basic aspect, the white balance, it was easy to notice that it was marked by a dominance of red, which overall changed the characteristics of the image. We could thus see a strong yellowing of the whites and a shift of all colours towards warmer shades. The gamma, which is a curve just as important, if not more so, was quite significantly lowered, resulting in a considerable drop in contrast, except at the beginning of the graph, where the television insidiously lost details. That’s all regarding SDR materials. Taking a closer look at films with a wide dynamic range, we can observe exactly the same phenomenon of yellowing of the white balance as in films with a standard colour palette. The EOTF curve, which replaces our gamma curve, is practically perfect and cannot be faulted.

We tested the U7S Pro model – as we always do – in the best factory-calibrated picture mode, namely Filmmaker Mode. We can evaluate the displayed colours in two ways. The most disappointing was the profile designed for viewing SDR content, that is, traditional television, YouTube, and other less demanding materials. The picture was clearly yellowed, which turned out to be a direct consequence of a poorly set white balance. As our graphs show, there is a significant deficiency of the blue component, which drastically affected the overall colour temperature. This is clearly visible on the ColorChecker charts as well as on the graphs of the colour palette itself, where most samples leaned towards yellow. Fortunately, the factory HDR mode fared much better – there, the colour errors were around a Delta E value of 3, which is already a really solid result.

As we mentioned earlier, LG televisions are equipped with advanced tools for carrying out the calibration process. We therefore used them to model the image in the way that the director intended. And without modesty, we must admit that we achieved this phenomenally. Both SDR and HDR materials present a level that clearly indicates that this is how a film should look. It is worth looking at the colour errors on the "ColorChecker" palette here, where practically none of them exceeds "1", apart from two samples.

We know, however, that the company Hisense is capable of much more – as previous generations have demonstrated – which is why we couldn't simply overlook the factory shortcomings of the U7S Pro model in everyday content. As is often the case, the television underwent professional calibration. The conclusions? This process brought about a colossal change. After manually adjusting the white balance and supplementing the deficiencies in the blue component, the annoying yellow tint disappeared as if by magic. White became naturally pure, and skin tones gained the appropriate, healthy hue. Importantly, calibration not only tamed the capricious SDR mode but also allowed us to extract the maximum potential from the panel, reducing average colour reproduction errors to levels nearly imperceptible to the human eye. The only thing we must criticise after the whole process is the very nature of the Mini-LED backlight and its specific interaction with the HDR signal. The aggressively tuned local dimming algorithms significantly interfere with the EOTF brightness curve. As a result, the backlight does not always work perfectly with the creator's intention – depending on the scene being viewed, the curve can noticeably deviate either above or below the reference, which at times disrupts the ideal dynamics of HDR imagery.

Once again, we will take a look at the function responsible for smooth gradation, but we will also address the one that aims to improve the quality of lower-quality materials. The default smoothing of tonal transitions, as we have seen, was not the worst, but it can still be improved. The function has a slider, which allows us to adjust its strength. We recommend using the first one, as it yields very good results and does not blur important details.

Image scaling in LG C4 is quite good; however, it cannot be said to be without flaws. The image is slightly sharper by default, although not in a very noticeable way. Admittedly, there are jagged edges on the trees, but this is not a major issue compared to other manufacturers.

The digital processing of lower quality signals is at a very high level here, thanks to the MediaTek Pentonic 800 processor used in the U7S Pro. The upscaling performance is equally impressive, meaning the television’s ability to enhance lower resolution signals to 4K. We did not notice any unnatural, sharp contours on the screen, and our test image featuring the model simply looked attractive.

The maximum refresh rate that we can set on the LG G4 is 144 Hz. Naturally, this is only possible when connecting the television to a very powerful PC. In other cases, we will be operating at a maximum refresh rate of 120 Hz, which is recommended if we primarily want to watch sport or content with a lot of motion dynamics. For those requiring high fluidity of the image, the manufacturer has implemented a multi-step motion smoother called "TrueMotion". It has been divided into two separate sliders that adjust the sharpness of moving images (De-Blur) and judder (De-Judder). Both sliders can be set within a range from 0 to 10, with each degree affecting the degree of smoothing, allowing everyone to find their golden mean.

The LG OLED C4 panel features an average response time of less than 1 ms (which directly results from our measurements), allowing for an incredibly clear image that is unattainable for LCD televisions, whose response times can be as high as several milliseconds. This is clearly visible in the pictures from the "UFO Test," showing no trailing blur behind the object.

The Hisense U7S Pro uses a panel with a maximum refresh rate of 165 Hz in 4K, and in game mode, it can reach up to 330 Hz at Full HD resolution. However, it is important to remember that these highest figures do not significantly matter in everyday use, as most content is still limited to a maximum of 120 Hz (for example, when gaming on a console). Nevertheless, the television handles motion quite well and performs really decently for an LCD construction.

There is little to criticise about the fluidity itself. In the menu, we find a motion smoother called "Motion Enhancement", which hides two sliders: blur reduction and judder reduction. These allow for manual configuration of the smoother, which works well in both films and sports, effectively enhancing the raw television signal.

We can already say that LG C4, like practically every OLED television from the manufacturer, is exceptionally good in terms of compatibility with consoles and PCs. Thanks to the implementation of four full bandwidth HDMI 2.1 ports at 48 Gbps, the manufacturer has included all features that enhance the gaming experience, among which we find simultaneous support for FreeSync and G-Sync technology. With such a tandem, gamers with a graphics card from AMD or Nvidia can confidently opt for C4. However, what should delight the players requiring the highest possible quality the most is the simultaneous implementation of HDR Dolby Vision and HGIG mode. The first is particularly important as it works with extremely low input lag in all settings.

A standard in the Korean manufacturer's televisions is also the implementation of GameBar, allowing for quick adjustments of settings "on the fly" without the need to exit the game. It also enables image adjustments for visually impaired individuals, which is a very nice touch. Another important piece of information is that when VRR technology is enabled, we will not experience a drop in contrast. This is, of course, due to the panel's design and the absence of conventional backlighting. However, it is normal for shades of grey to flicker slightly, although this is a characteristic feature of this function regardless of the manufacturer and television.

In summary: LG C4, just like all of the manufacturer's OLEDs equipped with high refresh rate panels and HDMI 2.1 ports, creates a harmonious whole with consoles. In practice, it is a complete television, and if we expect the highest possible performance in gaming, C4 will be an ideal choice.

If you plan to connect a console or PC to the U7S Pro, you will be more than satisfied – this television is excellent equipment for a gamer. Hisense has not spared any expense and has included as many as 4 HDMI 2.1 ports with full bandwidth of 48 Gbps. You won’t need to juggle cables as each port will handle the full set of features. We have an automatic game mode (ALLM) and VRR, which operates in a wide range from 48 Hz to an impressive 330 Hz. Of course, that 330 Hz is currently a gimmick for owners of powerful PCs, as consoles will be limited to 120 Hz, but it’s good to have that buffer for the future. The Game Bar also works very well during gaming. It’s a handy menu bar for gamers, where you can quickly change the picture mode, enable a crosshair in the centre of the screen, and even change the display aspect ratio to ultra-wide without having to exit to the main television settings, which will be appreciated by fans of PC simulators. The only downside worth mentioning is the improper implementation of the HGiG format in games. The issue is that the television ignores instructions from the console regarding the image generated in HDR10 and continues to forcefully interfere with the image it produces, trying to "enhance" it in its own way. This makes proper HDR configuration in the console menu (where you set brightness on symbols/checkerboard) somewhat difficult.