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That is again about content, right?
But if you sit far enough from your 4K screen, so that 2 pixels fit within your best visual acuity (ie 1 arc degree on average, every individual can do better or worse than that), then you won’t be able to tell if your screen has 1 or 2 pixels in that spot. So, you are effectively seeing a half of resolution, that is 1920 in horizontal direction. The farther you move, the bigger the screen area gets where your eyes won’t be able to tell details apart.
So, you’d want to move close enough to see the difference between those 2 neighboring pixels.

PS I agree, to even be able to play 4K content, you need a 4K screen to begin with.

While pixels is a talking point the tangible benefit of 4K is that more of the screen is in focus e.g if you pan around the image things beyond the foreground like signs, shop fronts etc are more legible. This is true whether I'm sitting at the "optimal" distance or further away, and is the end goal rather than being able to perceive twice or four times the pixels.
 
That is again about content, right?
But if you sit far enough from your 4K screen, so that 2 pixels fit within your best visual acuity (ie 1 arc degree on average, every individual can do better or worse than that), then you won’t be able to tell if your screen has 1 or 2 pixels in that spot. So, you are effectively seeing a half of resolution, that is 1920 in horizontal direction. The farther you move, the bigger the screen area gets where your eyes won’t be able to tell details apart.
So, you’d want to move close enough to see the difference between those 2 neighboring pixels.

PS I agree, to even be able to play 4K content, you need a 4K screen to begin with.

It might also be because 4K TVs include HDR? Thus no matter how far away because of different color technology the 4K will look better regardless.
 
While pixels is a talking point the tangible benefit of 4K is that more of the screen is in focus e.g if you pan around the image things beyond the foreground like signs, shop fronts etc are more legible.
Here I lost your train of thought. Is it in focus for the camera or your eye? How does 4K make a difference here?
It might also be because 4K TVs include HDR? Thus no matter how far away because of different color technology the 4K will look better regardless.
Yes, and HDR/Wide Gamut Color is again a completely different aspect of picture improvement. You can enjoy it also on FHD content (there even exist some 1080p "HDR" televisions, like Sony W and R series).
 
Here I lost your train of thought. Is it in focus for the camera or your eye? How does 4K make a difference here?

When I've compared the same titles in 4K and HD on my TV, there is a huge difference in the clarify, detail and legibility in everything in the frame. I have no idea whether it's because focus is lost during the compression from film or 2/4k file.

The bottom line is, 4K content looks justifiably clearer and more detailed than HD on my 49 inch, whether I'm sitting one or three meters away. I wouldn't certainly not discourage anyone buying a 43' from choosing a 4K panel.
 
Each to their own but I truly understand why the OP wants a 43" even if that market is shrinking
I am learning how to create videos now. It is a really interesting thing. Why didn’t I know it before? I want to show my harvest to the friend, so I followed the tutorials online burn video to DVD that I could play it on TV. It has a nice playback, you can try it...
 
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I have a nice mid range Sony Bravia 43" I bought last year. Size constraints of my cabinet, viewing distance and price all factored into my choice. It works flawlessly with my Apple TV 4K. HDR / Dolby Vision works very well.
 
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