LG OLED B5 vs TCL C9K

LG B5 is a moderately bright OLED TV. Regardless of the scene, it can generate around 500 nits of peak brightness. And interestingly, it does this even in full-screen shots flooded with white, where most OLEDs usually fall short. So, is this screen suitable for HDR movies? Yes – absolutely, because such brightness really allows you to feel the magic of HDR effects. However, it's worth noting that compared to last year's model B4, the new B5 is darker – by about 100 nits. It may seem like a small difference, but at such average peak values, it makes quite a significant difference. Fortunately, the TV makes up for it with another advantage – excellent coverage of the DCI-P3 and BT.2020 color gamut. As a result, HDR movies look really colorful, vibrant, and impressive even in more demanding scenes.

As we mentioned with black and contrast – the C9K can make a huge impression in synthetic tests. Our measurements showed that on a screen 10% filled with white, the television is capable of squeezing out… 4000 nits of brightness! It sounds astronomical, but – and here, unfortunately, the pattern repeats – the numbers say one thing, and practice says another. In real movie scenes, the situation looks different. At best, when the light effects occupy a large part of the image and the local dimming algorithm does not have to think too hard about what to do with thousands of zones – the effect is really good. At that point, the C9K can reach around 1500 nits, which provides a pleasant, intense flash and can indeed make a positive impression.

The problem starts with smaller elements – such as stars in the sky, the moon, or single reflections. That’s when the proverbial cat comes out of the bag: the algorithms are not yet refined, and brightness drops to even 400–500 nits. That’s a huge difference compared to the potential 4000 nits we saw in laboratory tests. Why does this happen? Most likely, the television is trying to protect the blacks in this way and minimize the halo effect around bright objects. Unfortunately, this comes at the cost of details – some details simply vanish, and the scene loses its nature.

We tested the B5 in Filmmaker mode and... we would like to see more TVs like this straight out of the box. Really. The white balance is set very well – there is practically nothing to complain about. Well, if one were to be very picky, one might notice a slight deficiency in blue, which makes the overall picture have a slightly yellowish tint. But that’s just our editorial nitpicking. Most of you probably won't even notice it. We also have some minor reservations about brightness management in HDR format. The EOTF curve – that is, the one responsible for how the TV distributes brightness in a scene – is slightly below the ideal. In practice, it can happen that the darkest parts of the image may be displayed too dark and simply... disappear. But these are details that only come out in measurements. Overall: we are impressed. But we also know that LG TVs respond very well to professional calibration. They can produce nearly reference-quality images, so – even though it's already very good out of the box – we allowed ourselves to take an extra step and fine-tune everything to perfection.

For color tests, as always, we reached for the Filmmaker mode – a new feature in TCL TVs for 2025. And while the direction itself is a step in the right direction, the execution leaves much to be desired. The white balance in SDR content turned out to be too warm – there was an excess of red. On the other hand, in HDR, it went in the opposite direction: the image became excessively blue. The Colour Checker test revealed quite a few color errors that were noticeable to the naked eye. An even bigger problem turned out to be what we mentioned above – brightness management. Regardless of whether we were watching SDR or HDR content, the image tended to blow out the entire scene, giving it an unnatural, even grotesque character. It's hard to call this a "director-created" mode – because the director has certainly never seen such an image.

We must admit that we didn't have much work with the LG B5. It's one of those TVs that looks good right from the start, but after calibration… it can really impress. The white balance was brought to almost perfect levels – to a degree of error invisible to the human eye, unless you are a professional colorist with a magnifying glass at the screen. We also managed to control the TV's slight tendency to dim the darkest details, especially in HDR scenes. After proper tuning, everything looks coherent: the black is still deep, but not information-hungry. The highlights retain a natural sparkle, and the colors align with the director's vision. It's really one of those models that show you don't have to spend a fortune to get almost reference-quality image. If you can decide on professional calibration – it's definitely worth it for the B5.

After calibration, we finally managed to tame the white balance – and it immediately translated into a more natural image. Colors finally started to look the way they should, and the overall presentation was incomparably better than in the factory settings. In other words – it’s worth taking a moment to improve this, as the gain is truly significant. The gamma responsible for managing brightness was also brought into order in SDR content, and the effect was more than satisfying. Unfortunately, when we turned on HDR materials, the situation quickly became complicated. No matter how we set the local dimming, the television had a tendency to do what it liked with the image – either it overexposed everything or dimmed the darkest parts too much. Exactly as we saw in the scene from the movie Billy Lynn. So, the color improvement after calibration makes a great impression, but brightness management in HDR remains the Achilles' heel of C9K and presents a certain technological limitation.

LG B5 really surprised us positively in terms of dealing with lower quality content. Thanks to the enhancement and smoothing features, HD or even SD materials get a new life. Importantly – when this option is turned on at the "low" or "medium" level, we don't get the impression that the image is artificially softened or overly smoothed. Details remain intact, film grain does not disappear, and object edges do not look washed out 😉. It's a really useful tool – especially if you watch terrestrial TV, archival materials, or content from YouTube in lower resolutions. The image is clean, cohesive, and simply pleasant to the eye.

Upscaling as such works very well – even content of poor quality is rendered with surprising fidelity. Unfortunately, there was a small hiccup. While the menu offers an option to turn off overscan, the television still struggles to display very low-resolution images correctly. It’s a minor detail, but when watching older materials – it can be annoying.

Digital image processing in TCL C9K is quite mediocre. The tonal smoothing feature seems to be present, but turning it on practically changes nothing – color bands are still visible, and it can unintentionally highlight elements we would prefer to hide, such as textures of objects. Fortunately, it doesn’t remove film grain, but that’s small comfort since the effects are still poor. Therefore, it's hard to recommend using this option.

On the other hand, image scaling performs much better. Lower quality materials look quite decent – characters and backgrounds are presented clearly, although, of course, with sources at 576p, physics cannot be fooled. Sometimes, characteristic aliasing on objects appears, but that’s the fault of the source itself, not the algorithm. A plus for not having issues with overscan – the image is not artificially cropped or enlarged.

The LG B5 is a television with a 120 Hz OLED panel. It may not sound as impressive as the marketing terms "144 Hz" or "165 Hz" found in gaming monitors, but honestly? The smoothness is still excellent. The picture is sharp, smooth, and simply enjoyable to watch – even when there’s a lot happening on the screen. The organic panel does its job – the pixel response time is nearly instantaneous, which means there’s no blurring or smearing that can ruin dynamic shots. Sports, fast-paced games – everything looks clear and distinct.

We also have LG's classic motion smoother, TruMotion. This feature allows you to smooth out films shot at 24 frames per second – in other words, most of what you watch on Netflix or on Blu-ray discs. If you set the “De-Judder” slider to lower values, you'll get an image closer to the cinematic experience – with a slight judder, but without artificiality. Higher settings? Soap opera effect guaranteed. Fortunately, LG gives you the choice, and you can tune everything as you like.

Like the C8K, the C9K is also a really fast television – both figuratively and literally. It features a 4K panel with a refresh rate of 144 Hz, and at lower resolutions, the display can even ramp up to 288 Hz. This speed translates into practice – when watching sports or playing games, the image looks very smooth and clear. Additionally, in films, we get an extra motion smoother called Motion Clarity, which allows us to adjust the fluidity to our own preferences – from the cinematic "judder" frame to almost theatrical smoothness.

There are already a few televisions on the market with the label "for gamers" that don’t really understand what that means. The LG B5 is not one of them. Everything here is right – there are four HDMI 2.1 ports, it has 120 Hz, VRR and ALLM, and it also has a Game Bar that is actually useful, not just looks good in the promotional folder. You connect your console – it works. You set 4K at 120 Hz – it works. You have an Xbox and want to play in Dolby Vision – it works too. And not in the sense of "it theoretically supports it," but rather it really turns on, looks good, and you don’t have to fiddle with the settings for half an hour. On top of that, there’s the HGiG picture mode, which LG has implemented correctly – meaning that HDR in games doesn’t turn the screen into a flashlight but shows exactly what it should. There are no surprises here, no strange limitations, no "buts." And you know what? That’s how it should be. Kudos to the LG B5!

For gaming, the TCL C9K is a complete tool. Here we have two (out of four) HDMI 2.1 ports with full bandwidth of 48 Gbps, so all key technologies work: VRR (variable refresh rate) and ALLM (automatic low latency mode). Additionally, the manufacturer added a really intuitive Game Bar, which allows you to quickly preview the most important parameters and adjust settings without digging through the menu. Also, TCL's policy is a plus – the TV is not afraid of any HDR formats, even in game mode. Whether it's HGiG or Dolby Vision for the Xbox Series S/X console – everything works as it should, giving the player wide freedom.