Gamezine: "Street Fighter IV has been getting much praise for its combination of classic gameplay and updated graphics technology, but there are differences between the console versions.
Firstly, you're going to notice more jagged edges in the PlayStation 3 game, since it doesn't feature any anti-aliasing. This is in contrast to the Xbox 360's 2xAA.
This isn't that much of a negative, since the 'jaggies' are barely noticeable when playing in the traditional gameplay view.
However, you might notice the edges in the character close-ups, a view where the PlayStation 3 suffers slightly in another area. During the close-up sequences, generally used with special moves, the PS3 game's rendering resolution drops from 720p to nearer 630p, which is then up-scaled for output."
Comparison pictures and videos can be found at the source.