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Short answer - yes, the Sigma 17-70 is a much better lens than the canon 17-55. The Sigma has a nice macro capability, and is reasonably sharp across entire zoom range.
I personnally have the Canon 17-85 ISM; wish I had purchased the Sigma instead for the superior macro capability (focuses much closer than the more expensive Canon lens, allowing higher magnification). I have shot the Sigma a couple times borrowing a friend's lens - very nice lens for the price.
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