I have not used either lens but the Sigma is in a different class altogether, one is a slow light weight travel/general perpose telephoto lens while the other is a serious wildlife/spors action lens that is huge and heavy in comparison. A better comparison would be the Canon 300mm f/2.8 IS or NON-IS version, now these would be much more on par.
Unless I needed the zoom feature I would opt for the Canon 300mm f/2.8 IS or NON-IS.
John.




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