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Depends on what kind of shooter you are - if you are a full time pray and spray shooter - forget the D800 - too much of a bottle neck in the backend, plus you will be buffer limited. The D4 has a buffer unlike any other camera I have shot with before. But even the D3s has a pretty deep buffer.
If you are old school film guy - 36 exposures to a roll of film - get the D800 - best of both worlds, you have the D4 for the pray and spray shots and the D800 for those single fire set-up shots.