I actually brought my 5DII along because I was concerned about how well the 7D would perform at 3200 with the 100-400L. I use the 7D for football as a second camera, but I've always had a 70-200 2.8 lens on it, so I never had to go above ISO 1600. One time I shot a stage play with both cameras and was very disappointed with the IQ of the 7D at 3200. Anyway, I shot the first few shots with the 5DII to see how well it kept up with the action (not very well) and then switched to the 7D. I agree with ScubaSteve that the 5DII shots are much cleaner and, to my eye, have a much more pleasing texture to them. That is not a knock on the 7D, it's just a fact of life when you compare a crop sensor to full frame.
And yes, I used the exact same settings and lens (100-400) on both cameras. For the record, I would rather have the speed and focus ability of the 7D in that situation than the cleaner image of the 5D. Those 7D images look perfectly fine to me.