Here's the first time we get to see a pretty direct comparison between the PSP and the Vita of new games. Namco Bandai has Tales of Heroes: Twin Braves for PSP and Tales of Innocence R for the Vita. Both are pretty similar styles of games and you can see the difference in visual fidelity pretty easily.
Gone are the jaggy edges (mostly) and there's a whole new range of colour finesse across the characters, and it goes without saying the effects have been cracked up several notches.
UPDATE: Trailers are now appearing for the games, here's the first for Twin Braves