The thing is, though, that when you're playing better players, you can guarantee that they'll know whatever character you choose inside out, and it's then that the tier differences become so apparent.
Playing as Vega, if I make one mistake against Sagat I could very easily lose half my health, in contrast to me having to pull off about four combos to do the same thing back. This is even more true of Zangief, but that match is actually pretty easy as long as I'm on the ball.
Not that it matters, 'cause Vega is a yodeling Spaniard and therefore more epic than any other character.