I really think Canon should have improved the 24-105 f4 L and left this one on the shelf. The only appeal of the range is if you have a 2.8. At this price I would rather invest in the Tamron 24-70 f2.8.
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I am not switching to Nikon, not as long as I can't put a 70-200 F/4 IS on a Nikon mount...
The Sigma 70-200 f/2.8 OS HSM costs the same and it's as great. Plus, you have a fully usable f/2.8, if you can live with the extra weight. AF works better on Nikon cameras than it does on Canon, if that was your concern.
IMHO after looking at the pic some more the very best you can do with this picture is use it as a learning experience... and toss it in the don't do this pile. It's one thing if it's candid and that's all you could get, but that hand is too difficult to remove and the framing is dead center which is normally a big no no. At the end of the day you could Photoshop it to death and it still won't make it a great shot simply due to composition and the visual distraction. I have a great many shots like this myself and I just try to see what I did wrong and try to improve on the next one or simply don't hit that shutter until it's perfect (even if it means missing the moment).