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I worked in the high-end audio video business for years. The difference between 720P and 1080P is arguably impossible to tell unless you are sitting about a foot from your television, or if you happen to have a projection screen of about 120 inches. 4K, of course, is possibly the biggest advertising hoax I've ever seen, considering that they are putting 4K on 40" television sets. I'd compare this to digital cameras that boast they can do 10 megapixels, but unless you are actually printing it on a large canvass, your camera/phone display is only 1 megapixel (720) or 2 megapixels (1080). It's funny to hear people talk about how much crisper their picture is having 10 megapixels when their display looks exactly the same either way because it can't even show you the difference. Sadly, the most important aspects of getting a great picture, which are motion handling, contrast, and black levels, have gone away with the death of plasma and the domination of LCD, which even on its most high-end set ever is still not that close to a plasma. Luckily, OLED is amazing and will eventually surpass plasma. Sorry to go off topic here, but my original point was that resolution is incredibly overrated and is cited incorrectly as the defining feature of picture quality.
Yeah, I cast streams to a 60 inch TV, but just based on viewing distance I can't reliably tell the difference between 720p and 1080p. I went 4K just for the hell of it because TVs are so cheap now in general, but all it takes is a quick glance at a viewing distance chart to realize you're probably being ripped off. Especially when a lot of 4K TVs out there have pretty miserable refresh rates.