As I read the AF on the A7R2 with Canon EF adapter challenges the speed of the Canon AF system (source:
http://briansmith.com ).
So if someone makes an adapter I will surely test my Nikkors against the Sony / Zeiss / Sony-Zeiss offerings before deciding which stays and which goes.
I only have very faint hope left that the Nikon D5 will challenge the A7R2 in any important aspect, so the Sony might become my new F (and If I have to add dumb weight in the form of a 10.000 shot Battery-pack just for counterweight purposed, Michael).
IBI Stabilization on any lens?
Leica-Q-quality EVF?
Full frame read out and binning?
Backlit CMOS with huge effective Quantum Efficiency?
I do not see any of this coming in the D5