I went from a D80 (10mp) to a D7100 with legacy lens as well. 17-35 2.8 80-200 2.8 50 1.4. I received the camera on Thursday and went to an Airshow on Saturday. The disappointing Images indicated that in addition to learning the new parameters, menus and button layout, I also had to refine my technique to compensate to the additional resolution. All is well now, and I could not be happier with the D7100.