Found and ineresting comparison between the Nikon D3 and Canon 1Dmk3
Nikon D3 vs Canon 1Dmk3
Nikon D3
300mm f/2.8 lens at f/2.8, C-Focus, Center Point Only
latest firmware v1.11
Nikon D3 Overall Average:
48% Out of Focus
Canon 1D MK3
300mm f/2.8 lens at f/2.8, AI Servo, Center Point Only
latest firmware v1.2.3, sub-mirror fix performed
Canon 1D MKIII Overall Average:
31% Out of Focus
The photographer concludes with:
Does this mean that overall I like Canon 1D MKIII better than Nikon D3?
No. It simply means that Canon still outperforms Nikon in this autofocus category. The Canon 1D MKIII is a great camera. However, my time with the D3 has led me to seriously question whether I would stick with Canon in the future. I really like the Nikon D3. Some advantages of the Nikon D3 over the Canon 1D MKIII for my type of photography are the increased iso range, the increased resolution of the lcd screen, and the ease of setting custom white balance.