I have seen banding on one occasion when I had the D7200 previously. This one during an outdoor Christmas Wonderland event where we took photos against the lighted Christmas tree. When boosting the shadows in post to get the faces to expose properly, I could see banding in the shadows.
Here's an extreme example (cropped away the bottom part of the picture with the face for privacy reasons):
Of course, once I tweaked the exposure further such that the sky returns to black, I don't notice this banding any more.
I think this is just a peculiarity of the Toshiba sensor in the D7100/D7200. When pushing shadows, the image tends to take on a magenta tint with linear lines as opposed to the more random noise found in the Sony-manufactured sensor on my old D5500 and current d7500.