if you pick up the 15-85mm you could probably sell the 28-135IS, and kit lens, and be at just about the amount for a sigma 10-20mm
This was a shot taken with my 15-85 at 15mm and you can see the distortion to the buildings left and right. Can you imagine what that shot would have been with a 10-22 at it's widest. I think 15mm is plenty wide enough for a crop camera, and no, I couldn't have moved further back, I was already sat on the front of a car.

IMG_1746
the 10-22mm at 14mm will show less distortion than the 15-85mm at 15mm
http://www.the-digital-picture.com …=675&CameraComp=474&FLI=2![]()
i'm also not quite sure what 'distortion' you're talking about in your shot...is it the way the buildings are angled inward? if so...that's not due to the lens, it's because of you angling the camera upwards to catch the top of the middle building in the frame....with a 10-22mm you would've been able to keep the lens pointed straighter, and the buildings wouldn't have that falling in look that you have







