Why Retina Displays and 4K TVs May Not Be Worth the Trouble, article (David Pogue, Scientific American)
Low-resolution graphics look no better on a high-resolution screen. If you've programmed an iPhone app, you know that it doesn't look any sharper until you reprogram it for the sharper screen. Until then, the phone just applies pixel doubling (substitutes four pixels for every one on the lower-res screen), which doesn't improve sharpness.
In fact, they look worse. You may remember that when HDTV came out, standard-definition broadcasts actually looked worse than they did on standard TVs. (They still do.) Well, guess what? Same thing happens on other screens.
In any case, the problem is especially severe on the biggest app of all: the Web. Few Web sites have been rewritten to accommodate Retina-type screens, so their graphics usually look awful.
I keep hearing this. But I just don't see it! I don't have the Retina Macbook Pro, but I do have the iPad 3 with Retina display (264PPI), and to me, web sites look the same as always.
If you use a big, super-high-res screen, what do you think? Is it just my eyes which are mercifully middle-aged? (They are not that bad, with glasses I can read the phone book and so on.)