15-85mm weak point is at 15mm and 85mm , i rather get something 17-55mm f2.8 (sharp at any range) + 70-200mm )
the 70-200mm is way way sharp at 85mm vs the 15-85 @ 85mm
What is the weakness? I have taken hundreds (or even thousands) of very nice photos at 15mm and 85mm with this lens and I can't see any weak points at all.
You can compare the 15-85 and 17-55 on this site and check for yourself: http://www.the-digital-picture.com …p=736&FLIComp=0&APIComp=0
1/250 f/3.5 @15mm
1/640 f/4 @18mm
1/160 f/6.3 @85mm