I finally got a chance to compare the AF tracking of the 7D to the 1DMKIII. I used my newly aquired 300 f2.8 and after doing a somewhat rough AF microadjustment on each camera. Unfortunately I wasn't quite as close on the MKIII as I was on the 7D. I left the MKIII at 0 and set the 7D at -5. After seeing the results from today I speent the afternoon using my Lens Align tool and discovered the MKIII was front focusing and should've been set to +5. The 7D should've been set to -4 so I was very close there. While this wasn't a competely accurate comparison due to the MKIII being off on the focus, it does appear that the 7D may do a slightly better job of tracking. I had them both setup the same for the AF settings. Sensitivity was set at 0 and the AI Servo 1st/2nd image priority was set to AF priority/tracking priority. Those are the only 2 settings that they have in common. The samples are straight from the camera except for cropping and resizing. 100% crops of the entire series for the7D can be seen here:
http://s208.photobucket.com/albums/b...cus%20Test/7D/
and for the MKIII here:
http://s208.photobucket.com/albums/b...0Test/1DMKIII/

Here are 5 from the 7D






Here are 5 from the MKIII






Despite the focus being off on the MKIII, I still did a better job of keeping the focus point of the rider's face with the 7D. Even though this wasn't a perfect comparison between the 7D and the MKIII, I'm very pleased with the results of the 7D.