Upload & Sell: Off
There's a thread about this in the nikon forum. I'm still waiting to decide if it is worth the trouble, currently my second D800 is on the way and will arrive tomorrow.
Focus lock is excellent with center point on the D800, more consistent than the 5d2 from my experience...even with my D800 that had AF issues on outer points (especially left side).
D800 is a very nice camera with many desirable features, including several the 5d3 doesn't have (active-point spot metering, EV adjustment with Auto ISO, huge dynamic range at base ISO, etc.) The camera is very responsive, the AF system is very responsive (with 85 f/1.8g), the tracking system is accurate.