Having had both lenses I would say that if careful when taking the shot the 28-135 is sharper, in fact it is very sharp. There is a fair bit of barrel distortion on the 17-85 at the 17mm end but it's not too bad.
Depends if you need the wide end. On a crop sensor camera 28 becomes 44.6mm equiv on full frame which isn't great for wide shots, landscapes so you need to decide what you are going to shoot. Most of my images are between 17 and 60mm. I use a 85mm f1.8 also.
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