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I totally agree with Miro about rangefinders and 'extreme' lenses.
The 50mm Summicron is a venerable lens on any of the film or digital M's.I'd ask what type of photography mostly floats your boat though?
If street, reportage, documentary is your thing they're hard to top but if you like dong anything in the studio they can be limited.
The Sony A7R2 is amazing, brilliant in fact with the lens you sadly sold:( I've used it on location and in the studio and been really impressed with it even against MF dig files (Pentax 645D). The fact that it also does pretty seriously good 4K video too is an impressive bonus:)Alternatively, I've used M8's and M9's on and off for a long time and they are cameras that just make you want to take pictures, just like my old M6 and Tri-X always did:-)
What you most like taking pictures of (and if you make any money from it) should be the biggest influence.
Like you said I guess, Head says Sony, heart says Leica...
Shit... I've been useless haven't I!
Sorry:D
I should add that had the Noctilux been on an SLR it would have been pretty useless - so it's no critism of the patch or finder in the M9.
I think rangefinders are very much my cuppa, I wish I'd tried a good one earlier (and had money for m mount lenses).