The 17-55 IS is a far better substitute for the 24-70L if you have a crop sensor camera. Less expensive, sharper optics, and IS.





The 16-35L II is the least impressive Canon lens I ever bought (and returned immediately). Horrible corners, no better center sharpness at 16mm than my Sigma 10-20 at similar apertures, and very expensive. Buy the Tokina 11-16 if you want the best in ultra-wide for crop sensors. Buy the 17-55 IS if you want the best standard zoom for crop sensors.