Read a review suggesting the 10-18mm f4-5.6 IS is actually sharper and half the price
here. Any idea if the extra is worth it for the f-stop? I get the impression that if they stuck IS in the 10-22 it would be the winner outright. The 10-22 does seem to have better light/colour into the corners. I tend to find I notice the lack-of-speed most on the zoom side of things on my longer lenses (5.6-6.3 is very limiting at times) but can see the potential benefit for indoor/evening shots.
How did you find the 17-55? I've toyed with getting it for a while now.