Lente L da Canon "péssima"?
Ken Rockwell: "Let me save you from reading the rest of this review. If you have $1,500, want the best ultra-wide zoom on the planet for your Canon full-frame (5D, 1Ds Mk III, etc.) or 1.3x (1D Mk III) camera and don't mind a little extra size and weight, just get one of these now. It is significantly sharper in the corners over the previous 16-35mm f/2.8, and focuses much more consistently."