To see 4 K effect with 50" TV you need to sit about 4ft from the screen. Your cat or dog or a toddler may be that close. For 1080p about 7 feet away ( as most of us sit). Therefore for most, 4 K is a gimick to sell more TVs and cameras. In other words how many of us have 100+ inch TV to view 4K from the normal couch 7 feet away.
but hey who cares about old technology... Look at 8K, you need to be 2 feet away with 65 " screen..
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The optimal distances for a 65” screen are two feet for 8K and 4.3 feet for 4K. If you sit somewhere between these two distances, you will see some, but not all, of the added detail in the 8K image.
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