Do you mean the 17-55 2.8 IS?


I can only speak of the 24-70. It has become my most used and beloved lens due to it's image quality and versatility. The images are very sharp. The colors are great. In very low light it will search a bit if you aren't using the center focus sensor, but I think it actually better than my 70-200 2.8 IS. I couldn't say if it is the best lens Canon has ever built, but if someone said that it was the best zoom I wouldn't argue. I've said many times before, I do not miss or crave IS in this lens. I think I'm a pretty steady shot and this lens, albeit heavy it is a very easily balanced lens.