I know you're just trying to expand on what was previously said, so please bear with me as I just want to use the quote as a starting point, in the middle of an existing conversation...
The differences in resolution simply can't be captured by such a simplistic chart... one that is oft-cited, yet never understood. They always state "full" benefits, and the math changes depending on what set of standards are used... and that math often points to the distance where you start being able to pick out actual pixels... and nobody (hyperbole, since I'm sure there's someone on planet earth that has) has ever sat that close to a TV. But either way, our living rooms are bound by walls, and unless we're setting the thing up in a gymnasium, you'll find it very hard to back up far enough to where the benefits disappear entirely on a screen over 40".
You have excellent eyesight.