I have the 24-70 and I have no complaints about the lens. It performs exactly as I would expect it to - It's fast, accurate, and sharp. However, I found my self bagging the lens after renting a 35L. The style I want for my pictures is the really shallow depth of field even on wider shots. I love the look because it makes the subject just pop out of the background. I can't get this look with my 24-70. It's also the reason I'm considering ditching my 70-200 2.8 IS for an 85L. No fault of the lenses - just doesn't fit my style.