8K TVs pack four times the pixels of 4K, but Cambridge research suggests most of us can’t see them from the sofa. Here’s where your money should go instead.
Walk into any big electrical shop and the most expensive televisions will be shouting about 8K. The demo footage looks glorious: you get honeycomb in close-up, every bead of sweat on a footballer’s brow, and a tropical fish you could practically fillet.
Then you take one home, sit three metres away and put on the same Netflix drama you were watching last week. The question is whether you would notice anything at all. Science now has a fairly firm answer, and it isn’t the one on the box.
Resolution is the number of tiny dots, or pixels, that make up the picture. Full HD, the standard of the 2010s, is 1,920 by 1,080 pixels. 4K, also sold as Ultra HD, doubles that in each direction to 3,840 by 2,160, which comes to about 8.3 million pixels. 8K doubles it again to 7,680 by 4,320, or roughly 33 million pixels.
That gives you four times the detail of 4K and sixteen times the detail of Full HD, at least on paper. Seeing it is another matter, because your eyes have limits and so does your living room.
For most people in most homes, no. In 2025, researchers at the University of Cambridge and Meta Reality Labs published a study in Nature Communications that tried to measure what the human eye can resolve on a modern screen. They used something more useful than an optician’s chart from the 19th century.
They measured in pixels per degree, which means how many pixels fit into one degree of your field of vision. This is a better measure than 4K or 8K because it accounts for both screen size and how far away you sit. Volunteers looked at fine greyscale and colour patterns while the screen moved nearer and further away.
The results were slightly flattering to us. The old rule of thumb said 20/20 vision tops out at around 60 pixels per degree. The study found people could resolve up to about 94 pixels per degree for black-and-white detail when looking straight at it. For red-green patterns it was about 89, and for yellow-violet only about 53. Our eyes are sharper than we thought, but they’re much worse at fine colour detail.
The catch for TV makers is distance. The researchers concluded that at the distance between sofa and screen in an average UK living room, a TV of around 44 inches shows no noticeable benefit from 4K or 8K over a lower-resolution 2K panel of the same size. 2K here means 2,560 by 1,440 pixels. By their figures, a 60-inch 4K screen viewed from three metres already exceeds what most people can see. Adding more pixels at that distance doesn’t make the picture look sharper to you.
To be fair to 4K, it still beats the Full HD set you may have upgraded from on a big screen. The point is that 4K already uses up most of what your eyes can take in from the sofa. 8K has very little left to offer at that distance.
Beyond a certain distance, extra pixels stop being a picture upgrade and become a line of marketing on the box.
The researchers also produced an online calculator so you can check your own setup. You put in your screen size and viewing distance, and it tells you whether you’re past the point where extra pixels make a difference. Get the tape measure out before you go shopping. It costs nothing and could save you a lot.
Hardly anything. The services most British households use stop at 4K. Netflix’s 4K streams come only with its top-tier plan, and you need a decent broadband connection. Netflix itself recommends around 15Mbps or more for Ultra HD. BBC iPlayer, Sky and the other big UK names offer 4K on selected programmes and sport. None of them streams 8K as a normal part of the service.
YouTube has a fair amount of 8K footage, mostly drone flights over Iceland and slow pans across coral reefs. It looks lovely for ten minutes. It’s no reason to spend thousands.
So an 8K TV spends nearly all its time doing something called upscaling. This means the set’s processor takes a 4K, HD or even standard-definition picture and guesses what the missing pixels should be. Modern TVs use AI-trained processing to do this, and the good ones do it well. But a top-quality 4K TV upscales lower-resolution pictures too. Most of the improvement comes from the quality of the processing, not from the higher pixel count.
The 8K models still on sale in the UK cost several thousand pounds. For that money, or much less, you can buy a 4K set that’s better at the things your eyes do notice.
Contrast comes first. This is the gap between the deepest black and the brightest white the screen can show. OLED panels, where each pixel makes its own light, give you inky blacks that make a film look properly cinematic. Mini-LED sets, which use thousands of tiny backlights, get very bright and suit a sunny lounge.
Next is HDR, short for high dynamic range. It lets bright highlights such as sunlight on water or headlights at night stand out without washing out everything else. Good HDR on a good panel will make a much bigger impression on you than four times the pixels.
After that, think about motion handling for sport and about sound. Flat TVs have thin, tinny speakers, so a decent soundbar is often the best value upgrade in the room. Finally, think about size. If you want more detail, a bigger 4K screen at the same distance does more for you than an 8K screen of the same size.
There is a small group for whom 8K makes sense. If you’re buying a very large screen, 75 inches and above, and you sit unusually close to it, the maths begins to tilt your way. The same goes if you use the TV as a giant monitor for photo editing at close range, or if money really doesn’t matter and you want the flagship anyway.
8K sets are usually a maker’s top models, so they often come with that maker’s best panel and processing. Some of the picture quality you’re paying for is real. It just isn’t coming from the extra pixels. You can usually get the same panel quality in a 4K version for a lot less.
For everyone else, the honest answer is not yet, and possibly not ever. TV makers have been quietly cutting back on 8K rather than adding to it, and there’s still almost nothing to watch in it. Save the money, buy a really good 4K set, and spend the change on a soundbar.
For most UK living rooms you don’t need an 8K TV. Cambridge research found that at typical sofa distances your eyes can’t resolve the extra detail, and even 4K is beyond many viewers on an average-sized screen. Netflix, iPlayer and Sky top out at 4K, so an 8K set mostly upscales. Put your money into a good 4K OLED or mini-LED set with strong HDR, and only think about 8K for a huge screen you sit close to.
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