While it is often overhyped, it does make difference in all scenes where there are a lot of thin lines, such as lots of text or comic book/manga pages.

From my experience with the BB10 Z10 screen, which is 1280x768, you get a larger amount of readable text on the screen at once. You can also easily read manga/comic book pages in landscape with fit-to-width and almost read them in portrait with fit-to-screen.
But indeed, a "HD" screen is not a dealbreaker, just nice to have.


Well, that is indeed possible - both due to physically switching more pixels and rendering graphics in higher resolution.