If you are interested in quick action then the Nikon D3 is the way to go.
Canon lost more than 80% of their business with the pro photographers at the last Olympic games for two reasons.
1 heaps of problems with their firmware and 2 their top of the range camera was not near as good as the Nikon.
I do not know about the 7D, the only what I can telling you is that the old 5D was and is a great landscaping camera, the later version of the 5D have a lot of problems like the mirror come loose in places with high humidity like north of Oz and the islands.
I believe that that problem was correted now but Canon push their products in the last 3 years without make sure that the camera is reliable.
If you go for the 7D I would wait for 6 months and read what it is going on with the cameras in use by the pros in the forums.


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