I hate to say this but I agree with Ken Rockwell on this statement:
Nikon has gone so far to show us an image with the Df and two F-Mount lenses, the 55mm f/1.2 (a good lens) and the classic Nikon 43-86mm f/3.5 (1963-1976), which is actually Nikon's poorest-performing lens of all time; a lens so optically awful that it single-handedly gave all zoom lenses a bad reputation for the next two or three decades.
But hey, it's all about the marketing and it looks good!