I suppose it depends on your requirements for sharpness, image quality, etc. Many are satisfied with the Sigmas, others think the Canon produces sharper, better pics. You can do a google search and get plenty of opinions and reviews on these lens. If you like a more blurred background effect the Canon is better, if you like better image stabilization then Sigma has better "OS". There are also plenty of images from each lens in the lens sample archive section.
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