I would love to see a MF RF style like the Mamiya 7 but it has to have lenses ready immediately for use or be able to hook up with other lens systems or i am not interested at all. Fixed lens stuff to me is a total waste of money. I know some folks love them but for a Pro its extremely limiting. I mean i would love to replace my A7r cam to a even higher MPX cam for my commercial work. It can be all manual everything even if I had to use a crank to start it up. LOL
I would still keep the A7 for the AF needs. But sure if Sony came out with something I would certainly entertain it. But it needs to hit a lot of check marks for me. Im just not into buying gear for awhile. I have what I need and no desire to jump on anything.
To be honest Sony would be damn stupid not to fit in the same 50mpx sensor under the radar of Hassy and Phase and capture a huge market that simply don't want to pay 20k. 7k maybe but at 5k people would jump all over it as long as there is lens support. The A7/A7r came out handicapped so not sure i want to go down that road again with limited lens selection.
A quick scan of KEH show that the Mamiya RF lenses are available, and all for less the a grand each in a good range of focal lengths.
No need for RF coupling as they would focus via EVF. Just takes a simple mechanical mount adapter ..... Then the usual issues of adapted ends can be discussed ad naussium.
Sony has a pattern ... Hook the fixed lens crowd first [on size], get everyone's appetite whetted, and then throw out the interchangeable lens version.
As usual Guy is 100% correct for a working pro photographer, not so much for a working pro Geophysicist!
Love to see something MF Digital that was less expensive than a BMW
Dave