I did it today
i have always used a DSLR from original D30 through to the A99, i bought the RX1 when it came out as my second camera and found I was using it all the time but did not like not being able to change focal length so I bought the A7r
the A7r is a bit of a Jekyll and Hyde the adapted lenses that are small have issues and the 36mp sensor whilst producing very good pictures requires you too constantly keep the shutter speed high and creates massive files sizes for moving them around
i tried using my A99 last week and after 1 day realised I could not go back to carrying something that big again I guess the RX1 changed what I want from a camera.
the M gives me the ability to use the best glass in a small package and the camera bag for it is tiny compared to my A99 suitcase on wheels