Neat comparison between PSP and PS Vita running PS One games

This Sony Japan page is actually about some PSN voucher contest for those buying PS one games. But, it also neatly shows the improvement between playing a PS one title on the Vita over the PSP.

Sure, they still look like PS One games, but the improvement is noticeable, with improved sharpness and readability due to the OLED screen and higher resolution, perhaps the filtering is slightly improved too, although Sony hasn't made much of a deal about it.