I don't see the point in upgrading the 18-55 to a 17-85. Yes the 1mm difference would actually give you quite a bit more in the picture but it's not that much of a difference. The 85mm (30mm difference) is a few feet difference (just walk closer). If you're shooting fixed objects then you don't really need a faster lens (unless you want the bokeh or speed when shooting people).
I can't exactly wrap my finger around what it is but IMO there really is no point in upgrading to a 17-85mm from an 18-55mm...
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