The genius of Sony here is that they have clearly targeted the Canon shooters looking for a way to use their excellent lenses with a more recent sensor technology. The problem they will be facing though is that this may be a one shot win without the expected long term revenue stream normally associated with interchangeable lenses cameras.
Indeed, considering how cheap the Sony is, I am not sure why any Canon shooter would want/have to sell his Canon equipment. Those guys are likely to invest back in Canon bodies as soon as something worthwhile comes out.
Exactly.
Canon's been concentrating on action and video, with a great AF system and 4k video, among other things. At low ISO, however, their sensors haven't really gotten any better since the 5D2 in 2008.
I shoot landscapes. They tend not to move very much. I also print large - to me, 20x30" is a small print - and shoot subjects with a very high dynamic range.
Trouble is, Canon makes good lenses. No-one else has a 24mm or 17mm tilt-shift lens as good as Canon, and I also have other good Canon glass I'd rather not get rid of. The only lens I have that will fit on a D800e is the Nikon 14-24. But all of these lenses will fit in front of an A7r.
To me, the A7r is a 35mm-format digital back, not a camera or a camera system that I'm buying into. If Canon lifts its game and releases a camera with a better sensor, I might buy that. If the next round in the IQ stakes is won by Sony, I'll get the A7r's successor. Same deal if it happens to be a Samsung, Fuji, Pentax or anyone else's camera - so long as it can fit behind my lenses.