[thxbb12]

Obviously the very expensive Leica M9 series fits the bill. Combine it with a Voigtlander 35mm f2.5:



or if you like things very wide, the Voigtlander 21mm f4 or inbetween the 25mm f4.

 

Not all pancake lenses give very high IQ (in fact, some have quite nasty bokeh).

 

Yes, there is obviously Leica, but this is not exactly for everyone. I'd like a camera with "modern" (I'll get flamed) specs and ergonomics, with AF (similar to MFT), an integrated viewfinder and that is less expensive than a 2 carat diamond. Basically MFT with a FF sensor.

 

I'm aware pancake designs are often not as good as regular design, but if it's good enough I'm happy.  Panasonic, Samsung and Pentax have nice example of good designs. And if one is looking for ultimate IQ, they would still be able to mount a regular lens.