Well, I can't test the 17-35 myself, can only dream of its $$$Originally posted by ckiang
Actually, many said the optical performance of the 20-35/2.8 is superior to that of the 17-35, but mininum focussing distance of the 20-35 is not that close.
Regards
CK

So far, I can only compare the printed result taken by somebody else. In my opinion, both are close (provided both pictures were taken at same focal length and same aperture, don't compare a picture taken at 17mm with the other at 20mm), but not as extra ordinary as voiced by many reviewers.
My Nikkor 24/2.8 still one notch superior.