Upgrade of D700 to D800 - Handheld Question

The D4 is meant for moving objects. Put it in the hands of a fashion photographer, a sports journalist, or a street photographer, or a birder and this camera SCREAMS professional. Those people would rather jump ship to Canon than use the D800 for those purposes.

Also, Nikon put out a PSA about how to use the camera, the leading official reviewers all agree that the camera benefits from proper tripod technique; but you admit to "almost exclusively" shooting handheld, so how would you even know the difference? My guess is that there wouldn't be very much resolution difference at all between your D800 and someone's D4 photography. The resolution difference is going to be easily discerned though when you compare D4 and D800 photographs where both cameras were locked down on tripods, set to mirror-up, and engaged with remotes. Because that's when a subject will be in perfect focus and you'll be able to zoom in quite a lot farther into the frame on that D800 because *THAT* is what resolution is. Will it translate to a picture put on your facebook page? Nope. Will it translate to a 20x30 print, yes because *THAT* is what resolution is. Another way you could use all that resolution is by cropping WAY WAY into a scene. If you have the resolution, you can do this; but only if you used proper technique first because otherwise the image is not exactly sharp, and that's not exactly useful for crop work.
I use the D800 camera for handheld stuff myself. But I don't pretend it's functioning at a 36MP level when I do so. When I need the full potential of all that resolution, I use proper technique.

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There are 10 types of people in this world, those who understand binary and those who don't.