Totally agree Vince. I wish it were full frame as well. I found using the Df was just instinctual, after decades of shooting film SLR's. The Zfc has taken some getting used to, it's not as good in low light (but I'm learning how to work around this) and the smaller sensor isn't going to give you as shallow depth of field as the Df.
The biggest issue for me, and the reason I finally got one to try, was finding MF lenses that work comfortably with it. Using either of the Nikon adapters for Nikon F lenses completely eliminates the advantage of the Zfc, it's small size. I had been playing with an old Olympus Pen F half-frame camera and had put together a small bevy of original lenses, and thought, "These 1/2 frame lenses might work great on a DX mirrorless." And they do.
Since I got mine, Cosina/Voigtlander has come out with a group of lenses specifically for the camera, and they are sized right for the Zfc. Pick up a set of those and if you can live with the smaller sensor, and lesser low light capabilities, I think you'll find it a great camera to shoot.
Best,
-Tim