How to describe the issue. I got a 70-200 AFS VR original model. On my D3s it seems to operate fine in FX mode with just a touch of softer corners with both VR on or off. I tried this lens on my D810 when I got the camera and found it lacking in focus. I thought it just didn't hold up with the 36MB sensor. Well today I put it to a real series of testing. Jury still out but I'm suspecting that the power requirement of running the VR is not good enough for this lens. With VR ON using various shutter speeds from ~1/60 - ~1/250 it get real soft on the right side. Even putting it in DX mode the right side is soft. The focus from the center to the left side is spot on in both FX and DX mode. Turning VR off and putting the camera on a tripod gives me clean images better than the D3S with the same corner performance. Left and right side are of equal in sharpness. The VR for whatever reason really is messing the focus up on the right side.
I also tried several other lenses 50 1.8, 20 1.8 and 105 f2 all seemed to be even focus left to right.