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Anonymous
The Sigma 18-50/2.8 has high chromatic aberrations, i woulnd't buy that if you are into high contrasts or outdoor photography. The Tamron 17-50/2.8 is better suited, but of course has it's own little problems (focus tends to go off into the distance in the corners). It is however a lot cheaper than comparable Canon offerings.
The Canon EF-S 17-85/4-5.6 IS USM is a bit disappointing, especially at 17mm. The 17-40/4L however shares some of the same problems at 17mm, but is generally of a higher quality. People looking for a good (and expensive Lens) are either buying the 17-40/4L (if they someday want to upgrade to a full sensor camera with EF mount) or the 17-55/2.8 IS USM if they are sure they are going to stick with EF-S cameras.
In fact the 17-40/4L is one of the most affordable L lenses you can get and a very good lens to walk around with.
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