Some random thoughts:
- I already have an M9.
- the Sony is a great small FF AF camera that should be used with it's own native lenses.
- the Sony is the reincarnation of the Contax G, let's call it Contax GD.
- using M glass on the Sony will be an exercise in frustration.
- the M9 has a nice CCD that produces beautiful colors.
- the M240 also has EVF and LV, but it's already 3 years old technology and has banding at iso 3200, and not even available yet.
So in my opinion, if you want to use M lenses, the M9 is a no brainer. If you want to use fantastic Zeiss AF glass just freshly designed for 36mp ++ sensors, the A7R is a no brainer. As for me, I already have the M9 and will buy the Sony with the two available Zeiss primes. Sometime later, one of them has to go and the one that gets used most often will stay. One thing for sure, I will not get the hybrid outdated M240.