I have a 135L that I've had for a few weeks and so far I'm happy with it. But I have an opportunity to trade it plus some cash for the 70-200 2.8 IS mkI. Obviously the 135 is faster, but the IS and versatility of the 70-200 is nice. If you aren't shooting action, which lens is actually faster after factoring in IS?





And for those of you using the big white lenses, how much harder is it to shoot events in a photo journalistic style?