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Kent, most people outside the very small a99/RX1 tent cannot believe this, but the ever evolving EVFs will extend vision-impaired and normal vision people's photographic 'career', no doubt in my mind about this. Image magnification (and peaking on occasions that benefit from it) basically enables this:
See your subject, press magnify (two levels are available) and focus your manual focus lens exactly from the sensor feed. It's actually hard to miss, and it aids your creative vision as well. Great for close up work and tele alike, and you see in good light: bokeh, dof, and exposure and can change them and see changes reflected real time in the EVF feed. Not perfect (yet) but in most light, a revelation, even stopped down - you know what you are getting.
Of course you are still reliant on Sony/Minolta (and CZ) AF lens if you want that as well. Looking at your list, all your CY and Leica 90mm can work using Leitax (chipped for IBIS), Mamiya 645 via a Mirex TS adapter. The camera uses the same sensor as the RX1, and has very good IQ, nobody complains about the files - I'll leave it at that. PM me for more, if interested. I refuse to use an OVF again, ever, I lose too many shots with manual focus.
You might want, as an alternative, to look into NEX7, for which three new AF CZ lenses are coming soon, they look very promising. The NEX EVF is as good technically, though I feel that the FF sensor real estate gathers more light and so has that basic advantage.