The AF-D and original AF-Nikkor lenses work beautifully with the DF: I used an original series 50/1.4 AF-Nikkor that came out with the N2020 with it.
The 16MPixel sensor is just right for older glass, and the saturation count and low-noise is amazing on it. For film, The Nikon F2, Nikon SP, and Leica M3 where "The IT" for me. Now it's the Nikon DF, M Monochrom, and M9 as the "Digital IT" for me.
Better camera: If you are used to interfacing with a Camera via it's computer readout, the D600 and D800 follow the Nikon N8008 path. If you want to use direct controls following a traditional film camera- such as what the Leica M digitals give us, the Df is the better camera. It's like setting a Nikon F3 down next to a Leica M7.
A few more High ISO shots. This camera at ISO 5000 with some noise reduction in post (and onboard I'm sure) seems to be pretty close to the M monochrome at ISO 5000 without NR. I love CCD's for their native performance, but CMOS plus Signal Processing is mainstream. I've done a lot of signal processing code, maybe that is why I like to M9 and M Monochrom so much.
This is ISO 20000 with Noise Reduction in LR turned off, NEF exported straight to JPEG. Vivitar 135/2.3, wide-open, 1/100th Sec hand-held. Framed and then focused on the eye. This is a good example of dynamic range at High ISO for any camera. This camera is the perfect SLR complement to my M9 and M Monochrom, just like having the F2AS paired with the SP.