I broke down and bought an M9 in Jan 14, when it became obvious Sony had messed up their cameras with a thick sensor cover. I had returned the A7r in 2013, and replaced it with plain A7, which I kept and later did the Kolari mod, so now it shoots M glass pretty well.
So I use the A7.mod as a second body to my M9. The RF took a couple months to get used to, but now I'm addicted. I do hate the M9 shutter, and the Sony shutter LOL, but overall I really like the M9.
I learned with the A7r that pixel count is totally meaningless. Especially if you prefer to avoid crops, as I do. Many problems ensue with tiny pixels that big pixels are oblivious to: witness A7S.
I won't be selling the M9.....ever. I would like the same thing with a normal shutter in the M6 footprint.