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The 17-85mm IS is pretty nice. It's has some distortion at 17mm, but other than that, very sharp, very nice.
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That, along with the smaller maximum aperature and higher price, are the main reasons (along with the macro capability) I decided on the Sigma 17-70 instead. However, I have since added the Canon 10-22mm to my bag, so the poorer performance at 17mm would not be as big an issue now.