I bought an A7 to go along with the A7r I already have on preorder since B&H has them in stock sans zoom lens now. I did it for many reasons but above all is image quality of the A7/r and the fact that what I'm seeing is good enough to potentially become my primary system except when I decide to use the Leica. The second reason is that I need to send my M9 in for a potential cracked sensor (finally it hit me.) the third is that I'm more comfortable with a Sony being stolen over a Leica (though I don't which any situation would ever occur with a thief.)
I will primarily use these as backups/ travel cameras since I travel quite a bit and eventually I will pick up the Zeiss and Sony G zooms more than likely. For now it'll be my M mount lenses exclusively.