WELCOME TO THE FORUM!!
Terrific shots here and in your other posts. We have a number of Canon users on the forum, myself included. I shoot with a 30D and used to have the Sigma 80-400mm. I sold mine to buy the Canon 100-400mm after seeing the results my son was getting with his, although, I think in good light the results with the Sigma were just as good as the Canon. Since this was Sigma's first stab at OS, I think that's where Canon has an edge. I seem to have better results with the Canon in poor light.
Keep the pics coming!
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