Very nice picture, I only have one question, is it stuffed?
I spent ages sat at the dining area at the Desert Botanical Garden in Phoenix with my 7D trying to get a picture of humming birds, I got tails and beaks and wingtips, but never the whole bird, not even enough to composite one from all the bits!
Darn those little blighters are quick, by the time I brought the camera to bear and focused, there was nothing there!
Anything with lesser AF was not going to catch up with those the speed they flit around.
Looks like the high ISO noise levels between the two are pretty close, at least close enough to not use that as a deciding factor in choosing one over the other. (based on this comparison between the two) Unfortunately, until CMOS (or CCD) technology changes, ALL digital sensors will have noise. What makes the biggest difference at this point is the size of the sensor and even more importantly, the size of each sensor pixel.
Honestly? I shoot all the way up to ISO 3200 without fear with my 7D. "Noise" doesn't stop me from getting the images I want. I know if a particular photo calls for some NR, I use either DPP or Lightroom 4. They both do a great job of getting rid of image noise. But again for the most part, I don't use NR much at all.
The photo I uploaded was shot with my 7D, 1/8000s, f8, ISO 2000 without flash using my 70-300L IS USM lens. No noise reduction, simply a RAW file processed using DPP. Nothing at all wrong with this photo, measured against any camera. Even in the dark areas (shadows) the color is smooth without a bunch of "hot pixels".
What you show there is among the reasons when I moved from the 300D I went to a 40D, the 400D or whatever x00D it was, were just too small in the hand, held one (x00 range) in store for a few minutes and could already feel my fingers starting to cramp, huge hands require a larger body for comfort. Of course the upgrade in specs was nice to have too.
the 70d has really nice features, i like everything about it except it is to small with big teles, your fingers pinch between the grip and the lens. with normal lenses it is fine. i would wait for the 7dii if you are using big lenses if not get the 70d