Above you mention that this is with a 65" display from 10' away. A 65" television with a 16/9 aspect ratio is 56.65" wide. So: A 480p (DVD) image is displaye

Above you mention that this is with a 65" display from 10' away. A 65" television with a 16/9 aspect ratio is 56.65" wide. So: A 480p (DVD) image is displayed at 12.71 ppi. A 720p image is 22.59 ppi. A 1080p image is 33.89 ppi. A 4K UHDTV image is 67.78 ppi. With 20/30 vision at a distance of ten feet you are capable of resolving 19.10 ppi, so 720p is an improvement over 480p, but anything higher is wasted pixels. With "average" 20/20 vision you (or perhaps your guests) would be able to resolve 28.65 ppi, still somewhat less than the full resolution of a 1080p image but a distinct improvement over 720p. With 20/15 vision you are capable of resolving 38.20 ppi, so, with a viewing distance of ten feet and a 65" television, 4K is actually a modest improvement over 1080p. If you can actually see a difference in resolution from ten feet with your glasses off, you may want to speak with your optometrist, as by definition you have been provided with an incorrect prescription. Some further information and the formulae used above are available here: http://jaredjared.com/2012/10/visual-acuity-dpi/ http://jaredjared.com/2012/10/visual-acuity-dpi/ *Edit: I accidentally used 4096 pixels of width (the cinema standard) to compute the 4K ppi, rather than 3840 (UHDTV); corrected above.