read what you wrote again , any Nikon camera
Thats right, any nikon camera.
then read my answer again about the time it takes to evaluate a AF system
Read my answer again, I've already have. You know your quite naive that the 51-point system is almost exactly the same from the D3-D700 system. They use a multi-cam 3500 Series AF system, which is good but old already which the canon 61-point system make it show its age.
I've always felt its AF was hesitant, while the canon just hits period.
The burden of proof is on you, and many others have already agreed that the 61-Point AF system is the best thing since sliced bread.