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AFAIK, the D600 and D7000 do not share the same autofocus. People have grown accustomed to saying that because they both have 39 pts.
The D600 does not use a "gimped" DX af system, it will allow autofocus with f8 lenses, the D7000 will not. Also, I believe it works in lower light conditions.
They both use the CAM4800 system, just DX and FX versions (I think the difference is mainly proxcessing power and integration into the 24MP FX platform). I agree that it isn't "gimped".
D600 uses the same autofocus module that D7000 uses. In other words, it uses a DX AF module.
I'm not sure what you're suggesting - if what I've read is correct, the AF field coverage isn't larger for a D3s than a D600, it is just 39-point vs. 51-point. Unless you're using superzooms or TC's, I'm yet to hear anything bad about the CAM4800 AF system, and I'm sure it will work well for the D600.
Like I said earlier, "As long as the subject is in the center of the frame, the AF module should work just fine."
How is that different than the D3s?? It also has the AF sensors clustered in the middle...