Is your character too "floaty" when jumping?
Under character editor -> physics, all you have to do is increase the weight and jump force of your character.
For high fast jumps, try for example 400 for your character's weight and 60 for the jump force.
For a more realistic jump, try 350 for character weight and 40 for jump force.
I found 300 for character weight and 45 for jump force to be the ideal for SF4 like physics.

This is also useful if you don't want to alter the gravity of your game.