To ensure 90% of the population could likely not spot the difference, you would need to place a 50-inch 4K TV 5.9 feet away. To extend this threshold to 100%, it would need to be at least 6.8 feet ...
For an average-size UK living room, with 2.5 metres between the TV and the sofa, a 44-inch 4K or 8K TV would not provide any additional benefit over a lower resolution Quad HD ...
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