LG OLED G5 vs TCL C8L / QM8L

LG G5 with the new Tandem OLED panel brings the biggest change specifically in terms of the brightness of the television. And it’s quite impressive. This is truly an astronomically bright OLED. In every tested scene – whether it’s point lights or full-screen whites from the movie The Meg – the brightness on the G5 exceeded 2000 nits. Just a year ago, such values on an OLED were simply unimaginable. And here we are – the G5 comes close, and at times even surpasses the best Mini-LEDs on the market. A new feature of the Tandem OLED panel is the expanded color gamut coverage – and here the LG G5 performs almost perfectly. DCI-P3 achieves a full 100%, while BT.2020 maintains around 83%. These are some of the highest values currently available on the market – it’s hard to find any other television that comes close to such results, unless we are talking about the best displays with QD-OLED panels. The G5 has nearly reference-quality HDR – both in terms of brightness and color saturation. This is an OLED that can truly shine – and not just figuratively.

In terms of HDR, the TCL C8L turns out to be a hellishly bright television – and I mean literally. On a synthetic chart of 5%, our measuring equipment indicated a result exceeding 4500 nits. This is a result that is downright cosmic, considering that reference director monitors, which we often refer to in our materials, typically operate around 4000 nits. Does this mean that the C8L breaks barriers and climbs to the technological peak of Mini-LED? Not exactly. Dry synthetic tests are one thing, and real movie images are another. In real, varied scenes, the C8L achieves a peak of around 1600 nits. This is still a very good result, ensuring a very high level of HDR dynamics, but also clearly lower than what the manufacturer boasts in the specifications. The trouble starts with very small flashes of light – then brightness can drastically drop to around 600 nits. The algorithm tries at all costs to maintain deep black and minimize halo effect, but it does so at the expense of HDR impact. This is perfect evidence that laboratory charts rarely correspond to what we ultimately see on the screen.

Huge applause is due for color reproduction, all thanks to the new generation of SQD (Super Quantum Dot) quantum dots. The coverage of the DCI-P3 palette reaches 97%, but the true jaw-dropper is the measurement of the extremely demanding BT.2020 space. The C8L achieves as much as 90% in it, placing it alongside today's top screens that boast RGB backlighting. Importantly, unlike some screens with Micro/Mini RGB backlighting, this effect is stable regardless of the scene displayed. Of course, one must remember that content mastered for such a wide gamut in films or series is still a rarity. However, the mere fact that the panel has such a "color reserve" deserves immense admiration.

Our test unit LG G5 struggled with some issues in the factory Filmmaker mode. And while the image might have seemed fine to most people, we knew that this TV was capable of much more. This mode had a clear excess blue tint in the white balance, resulting in a strong cooling of the image – particularly in HDR modes, where there was also a lack of red. The picture seemed cold, and its sharpness was artificially boosted and unnatural. Another significant issue was the brightness characteristic. In SDR content, the situation wasn't the worst, aside from a slight dimming of the entire image. However, it performed much worse in HDR materials – due to improper brightness management, the smallest details could completely disappear from the image, and larger, bright elements appeared overexposed and lacking gradation. Luckily, the G5 supports calibration using 3D LUT (a tool for professionals to calibrate colors), so we decided to take advantage of its professional background and see what it was really capable of. Because while it wasn't terrible even before calibration, the potential of this TV definitely deserved more.

We tested the TCL C8L in the best factory picture mode available in this TV’s menu for image fidelity. That, of course, is Filmmaker Mode, which appeared in this brand’s software relatively recently (a year ago in the "K" series). Thanks to it, an average user can get a pretty good color reproduction straight out of the box, although it is certainly not a perfectly tuned mode. Looking at the factory white balance of our unit, both in SDR and HDR material, the red component was clearly lacking, which made the image noticeably cooler and caused a slight shift toward bluish-green tints. The issue of brightness management is also ambiguous, as we mentioned earlier. While for SDR content the gamma linearity is actually correct and holds steadily at the reference value of 2.4, in HDR things look much worse. Tracking the EOTF curve clearly shows the TV has a significantly boosted brightness across the range, which can make the final image overly bright and inconsistent with the creators’ intent, and that in a mode that by definition should avoid that. Of course, like every sample in our lab, this one also underwent professional calibration, and its results are shown below.

After completing the calibration process using professional tools, we can confidently state that the LG G5 offers nearly reference-quality image. Most of the errors related to white balance and the ColorChecker test are below the value of 2, which is a phenomenal result, practically imperceptible to the human eye. And while one could still criticize that in HDR films the television tends to slightly dim the smallest elements of the image, in practice, this does not negatively affect the overall impression. Hats off to LG, because once again they provide the user with enormous possibilities for adjusting their display – and this, combined with very good parameters of the panel itself, results in an image that is truly hard to surpass.

As you can see, the results of a professional calibration of the TCL C8L are really promising, thanks to the extensive adjustment tools the manufacturer put at our disposal in the menu. Above all, we were able to completely correct the white balance — we eliminated the red deficiency, so the image finally stopped drifting toward unwanted cool tones. After that adjustment, errors in the ColorChecker test fell to near-reference levels, regularly landing below a Delta E of 2, which is below the threshold of human perception.

If the test patterns look this perfect, you might ask: why then the lower final score in this category? The answer lies in the brightness management discussed earlier. Although the menu includes sliders that let you precisely straighten the EOTF curve on synthetic signals, when confronted with actual movie material (I recommend enabling the EOTF filter when watching movies), you can see that in most scenarios the TV still reacts to HDR metadata its own way. As a result, the picture can be slightly over-brightened and not faithful to the creators' intent, and it was precisely this lack of consistency with real films that cost the C8L a few points.

Upscaling and digital image processing in the LG G5 perform very well. The television handles lower quality content exceptionally, especially when the "Smooth Gradation" feature is set to a low level. In this mode, it effectively removes unwanted artifacts and issues with visible tonal transitions. It may also slightly smooth out some desired details, such as the subtle texture of clothing or skin, but importantly – it does not remove film grain, so it’s hard to say there’s a serious compromise here. It’s one of those options that’s definitely worth enabling.

The G5 also does well with upscaling, which is improving the quality of older materials. The test image with the model looked really solid – slight edging was visible, but that’s an effect that can’t be completely avoided. Additionally, there were no issues with overscan, which – contrary to appearances – is not obvious, even in 2025.

This year the C8 series and higher models received probably the biggest and most anticipated upgrade in TCL’s history, and it specifically concerns digital image processing. The C8L is the lowest-end model in the manufacturer's lineup to be equipped with the latest flagship chip, the MediaTek Pentonic 800 (listed in the menu as MT9655). Thanks to its processing power, the feature called "Gradual Smoothing" finally works as it should. The algorithm effectively eliminates unwanted posterization (ugly tonal transitions/color banding), doing so intelligently enough that it does not degrade the sharpness of other details.

The processor also handles upscaling lower-resolution content to 4K very well. Although evaluating this element can be mostly academic, because the differences between today's TVs in this class are very subtle. The most important takeaway is that TCL finally has nothing to be ashamed of compared to the competition.

The motion fluidity on the LG G5 is simply phenomenal. The TV is equipped with a 165 Hz refresh rate panel, and this combined with the instantaneous response time of the OLED matrix delivers incredible results. The picture doesn’t stutter or smear like on classic LCD TVs. Like most LG models, the G5 features a motion smoother, which can be useful when watching movies – of course, we're talking about the TruMotion mode. With the “De-Blur” and “De-Judder” sliders, we can adjust the smoothness of older material according to our preferences, whether we want to preserve the characteristic film stutter or move towards a more fluid, television-like effect.

The TCL C8L is equipped with a fast panel that has a native 144 Hz refresh rate. That spec will be most appreciated by demanding PC gamers, while most users, who rely on consoles or TV broadcasts, will use a steady 120 Hz. It is at 120 Hz that motion processing algorithms handle image rendering for movies, series, and sports. In the TV’s menu you’ll find a "Motion Clarity" option that lets you adjust the motion smoothing to your preferences. The algorithms handle cinematic material at 24 or 30 frames per second (fps) as well as dynamic sports broadcasts at 50 or 60 fps, maintaining appropriate smoothness.

Features for gamers? Perfect. That should be enough for you to know what level we are dealing with here. G5 is a television designed with gamers in mind, so we find literally everything one can expect from a gaming screen. There is Game Bar, support for high resolutions with high refresh rates – that is, 4K at 120 Hz, and even more, because the panel has a refresh rate of 165 Hz (which PC gamers will benefit from). The television supports variable refresh rates (VRR), automatic low latency mode (ALLM), and correctly supports HDR in games thanks to HGiG. All of this adds up to one of the best sets of gaming features available on the market. Well done, LG.

For gamers – especially for those with powerful PCs and several consoles at the same time – the TCL C8L is a true beast. It’s the first model in the manufacturer’s lineup equipped with four full HDMI 2.1 ports with a maximum bandwidth of 48 Gbps. This is directly thanks to the new Pentonic 800 processor we wrote about earlier. Additionally, the TV seamlessly supports virtually every gaming feature. It has an automatic game mode (ALLM) that reduces latency to minimal levels and full frame synchronization (VRR) operating in an impressive range of up to 288 Hz. We’re also talking about standards like G-Sync or FreeSync from Nvidia and AMD. When it comes to image display standards, there are also no compromises: the C8L offers complete support for HDR formats in games, including gaming Dolby Vision and the HGiG profile. All of these features can be conveniently managed from a very readable game bar (Game Bar), which we can customize according to our preferences. From a purely gaming perspective, there really isn’t anything to complain about in the C8L – well, maybe aside from the previously mentioned slight ghosting. But other than that? It’s an unflawed machine for gamers.