Thank Ron for starting this thread!
I have now had the A7r for just over 2 weeks, and I could only describe it as a love/hate relationship.
I have a number of lenses that work amazingly well, the 50 Cron Rigid DR, 50 Nocti f/1.0, 24 Lux Asph and the 75 Lux, and of course the FE 35/2.8 which is great to have. I am yet to test the 50 Lux Asph and 35 Lux FLE. I am not concerning myself with other WA's for now.
I am a 50mm FL shooter, and mainly portraits, so in essence the camera should work brilliantly. The IQ from the above lenses are amazing, almost MF in quality.
The ergonomics are the issue:
(1) The MF at the moment requires a two step function to accurately focus. This is important for portraits, as you wish to nail a near eye. With the M240, it is purely a movement of the focusing ring. I realize unless you opt for special adapter, there will still be a single set button to initiate the magnified view. This is frustrating.
(2) The sensitivity of the magnified focus mode is easily reset, just by movement of the camera, without pressing the shutter. This has been noted in the FM forums.
(3) The playback is nothing short of crazy! This is a three step process, so as to view files making the important parts of the image are in focus. Play, C2 and then the scroll button, which is very slow to reduce the magnification.
(4) Another major issue is the EVF, in bright ambient light. I have tried setting the EVF to manual maximum brightness, and turned off the camera settings, and still I cannot view the scene when I have the lens set at f/2.8 or more. I have tried this with another A7r, and it has the same issue. In low lighting, inside or shade the EVF is great. I find the Oly VF2 on the M240 to work well in bright ambient light, even though it has a slightly lower resolution. The other problem, I am finding is the delay, and finding quite often for portraits, I have captured people with eyes closed, or the expression that I have just missed!
I want to love this A7r, and the IQ is amazing, but I putting the A7r aside for now, and just rethinking on how best to use it, and maximize its potential.