Fast, very sharp (esp at shorter focal lengths), reasonably compact and light.
Distortion, edges only good, large filters, noisy AF, quite flare-prone. Expensive.
Having used 2 examples of the Canon 20-35mm F3.5/4.5 USM, and 2 Tokina 20-35 ATX F2.8 PRO lenses, I can safely say that this lens is the sharpest of such a range that I have experienced. It is very capable at widest aperture, especially at shorter focal lengths and really shines when stopped down...
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