I have both the 55mm and 85mm Zeiss Otus lens and have been using them with my D800 and D810 bodies. I've had the 55 for a few months, and the 85 for about a month. I just completed an 8-day studio catalog shoot where I relied on the 85mm on the 810 for almost the entire shoot (good lens for full-length fashion). On the 7th day, I started getting confusing info on the camera from the lens. Instead of putting up the f-stop it would only show whole numbers from 2 to 7. When I would take the shot it would not record the lens information in the file data. I could not shoot at the desired aperture. I experienced this with both the D800 and the D810. I could get the 55mm Otus to work on both bodies just fine. Upon further poking around, I found that if I manually held the lens in place on the body (i.e.. put twisting pressure to make a more firm connection) the lens would function properly. I was able to complete the shoot alternating between the 85 and my 70-200.
I plan on sending to Zeiss when I return to my home base from this project. I am wondering if the substantial weight of the lens is actually causing an interruption in the connection between the lens' cpu and the camera. Has anyone else experienced this?
D3X, D800, 17-35, 28-70, Zeiss 55mm OTUS, 85mm Zeiss CF.2, 85mm PCE, 70-200 VRII, 105DC