I have a very limited budget which rules out lenses that would be top contenders for my needs right now. I had thought that this Sigma lens was rated higher than Canon's newer kit lens (IS II version). But on the lens comparison site Photozone, the Canon lens rated higher optically. I need one of these lenses for my upcoming trip to S. Utah for the majority of my landscape and scenic shots. Ideally something like the Canon 15-85 would be the lens of choice, but I don't have $650+ to spend. So which of these 2 lenses do you feel would be able to deliver the goods better? If you'd like, you might throw the Canon 17-85mm lens into the mix as well. I can get any of these lenses for within my budget of under $300. I'd prefer not to rent any lens. As always, thanks for your feedback. And please keep the topic to these 2(or 3) specific lenses.