I just opened the first files from a shoot with the Nikon D810. It looks really bad, it introduces ugly postarization.
Switching a nikon profile to the adobe standard or turning off camera calibration fixes it.
Yes, I have the latest version, last week I wasn't able to open them yet.
Oddly enough,.. opening the same through photoshop ACR does not have this problem. I do see it on all D810 profiles but not in "Adobe Standard". Someone else called this banding, we could name it that.