Its not an accurate graph, and changes from person to person.
That graph probably suits my granmother who wears glasses.
I on the other hand, noticed the clear distinction between 720p and 1080p, on a 42in display, sitting from a 4 metre distance.

I shudder at the constant 576p resolution that streams on digital TV. With only one other channel showing 720p resolution, and another (sports oriented) channel showing 1080i.

Besides the console and BluRay, its hard to get proper content on the home screen. There's native YouTube support so I can usually get 720p content, and occasionally 1080p as well. But the trick seems to be getting a TV Box like Roku 3 (best content provider, but limited to US and UK only), a Nexus Player (Android Apps and Casting), or Apple TV (AirPlay and few iOS Apps).

I have noticed 4K making an improvement, but I think this would be noticeable at a closer distance (2.5m) and on a larger (65in) display.


P.S. by the way, I only just understood the really weird SONY "K" naming scheme. So a 1024 x 576 (regular TV) resolution is actually a 1K resolution.

1280 x 720p (or 1366 x 768) is x1.5 bigger, but its still labelled as a 1K resolution. Whatever.

1600 x 900 is 1.5K resolution.
1920 x 1080 is 2K resolution.
2560 x 1440 is 2.5K resolution.
3200 x 1800 is 3K resolution.
3840 x 2160 is 4K resolution <-- this is about 8MP, close to human eye focal limit. See my above post.
5120 x 2880 is 5K resolution (iMac Retina)
6400 x 3600 is (unusual) 6.5K resolution.
7680 x 4320 is 8K resolution.


And also noticed that new iMac Retina is a MASSIVELY FLAWED gadget. On sale for $3,000 but is worth only about half that price. Why? It doesn't take advantage of that screen, not even OSX, it doesn't even do PC Gaming. Its only worth as much as a $1,500 dektop. But I would say it could've been a $3,500 worth device if it had 2 very minor differences; HDMI-in and gaming gpu. Apple Y U ALWYZ LET DOVVN ?!