What's wrong with the 5DMkIII?
For me, maybe the NEX series. The 7 seemed like it was something i could have wanted, but the moment i touched one, i realized it was 'just' a digital capture device. I just don't like the feel of any of the digital cameras. I've used the 5D1 and 2 when i had to, but even they just don't have the tactile/sensual of film cameras.
Digicams keep getting more and more 'capable.' But, i've never heard anyone wax poetic about how they feel. On the other hand, people go nuts for their favorite old M, Pentax ME, OM, Nikon F-something, etc. Who has a love affair with a digital camera?
I also never really loved my Hexar AF. In the few rolls i shot with it, the lens did nothing 'magical,' and i always felt stifled by the shutter speed limitation.