The 17-85mm f/4-5.6 IS USM is not going to give to you any significant optical improvement over the 18-55mm. Unfortunately, if you want a noticeable IQ improvement, you need to be looking at the 15-85mm or 17-55mm.
The 17-85mm f/4-5.6 IS USM is not going to give to you any significant optical improvement over the 18-55mm. Unfortunately, if you want a noticeable IQ improvement, you need to be looking at the 15-85mm or 17-55mm.