#1. put camera on tripod #2. Use the widest fasted lens you have (ie. 24/2.8 etc) #3. Point to something like a brickwall etc #4. Using the viewfinder, move the focus to the desired test focus point #5. Change to Live view, the focus point will be the same #6. Take photo using live view using live view auto focus #7. Change to view finder, focus on same spot (should be there already) using view finder auto focus, take photo #8. compare the two photos. Should be mostly the same. Viola! #9. Repeat for other focus points.
I did this very thing with all 51 points to show Nikon that I did indeed mess up my Nikon when i dropped it.
I picked up a D800 in mid-December and I am very pleased. No left focusing issue that I note. I am still learning all of the capabilities, but this camera appears rock solid and I am pretty picky. Unlike the ill-fated D600, Nikon appears to be shipping a decent D800.
I took the D800 to a museum the other day that had a thing against flash photography. No problem. I took many photos on a tripod. The lighting did not really matter. I moved the focus point all over the map. Of the 80 shots or so, I came away with one that looked soft and I believe it was some diffraction because of shooting at F/11.
I purchased my D800 about two weeks ago. I followed Thom Hogan's directions to check to see if I had the problem. It is possible there was a slight difference, but all the views were very close. I'm pretty sure I don't have the problem as Thom describes it.
Leonard Evens Professor Emeritus, Department of Mathematics, Northwestern University