Acku on the SRK.com boards has added in a ranked frame data chart showing how the character's EX-Projectiles stack up against each other.

While you can find this information on our frame data pages for Street Fighter 4, what's nice about his post is you can do an easy comparison between all of the characters various stats very quickly.

He also includes a few notes about the data and a letter grade for each category. If you'd like to see how their normal fireballs match up, look up his original post here.