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I have a Sigma 70-200 mm and have seen the quality that a friend gets with his Canon 70-200 mm (that he's paid a lot more for). If you're a professional and selling photos, there's likely a quality difference but I couldn't see the difference that justified a whole lot more $$$. I generally believe that you should invest in good glass; however, I think knowing what you're doing with the camera can make any lens standout.
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