Also, SFIV is like chess. A limited move set but near-infinite possibilities. Amazing game.
A lot of the characters in SF 4 have context specific moves not listed in the game moves list.
On a slight tangent - I impulse bought Street Fighter 4 in the Steam sales having played only a couple of hours of SF2 about 15 years ago; why do all the characters seem to have about 10 moves? In Tekken and Virtua Fighter they've got tons but in this they seem to have fuck all. Weird.
There is negligible difference between any fighting game made since Street Fighter 2