The odd curiosity is that Sony, despite dominating the professional video marker since forever, despite developing most of the technology that comprises a DSLR sensor, have never really caught the publics imagination in the way that Canon and Nikon had (a problem they inhereted from Minolta to be fair)
So is Alpha dead? Is NEX dead? Now this new system.
What about SLT? Wasn't that going to kill of the SLR? If I had bought into Sony DSLRs when they first arrived, and then bought say an a700 or a900, I would be pretty pithed off.
Every year they change the game, and every second year they change it again.
Folk spending serious money on kit are in it for the long haul. Nikon may have DxO foaming at the mouth for now, but all it takes is a camera launch and those who blow with the wind will be coming back to Canon.
Sony are pretty knackered as an entirity, they've been making grand claims for the last few years about market share projections etc, yet continually re-invent, re-lauch. There is no consistency, no grand vision.
If you have L or AF-D lenses, you've bought into a system. You'll play the long game. Sony just aren't.
An Sony know this, thus the efforts to make bodies that folk can adapt their lenses to.
Sony have historically bought in low end canon lenses for their cheaper camcorders and point and shoots, and used zeiss designs for their decent stuff, in the high end broadcast market it's always been fujinon or canon lenses.
Maybe Sony just don't like make lenses, or have realised that the only way they are going to compete is to let their users adapt their existing canon or nikon lenses.
I find it hilarious to see all these metabones EF to NEX adaptors, blackmagic EF etc, If I had a free choice of lenses to use for video, canon EF would be actually quite far down the list... no iris ring, mostly not parfocal, rubbish scales.
Don't get me wrong, I love them for stills, and I have them so use them for video, and get results I'm pleased with, and I'm going to use a c100 because of these same lenses I've berated.
But the point is, Sony have brought out an interesting camera, in much the same way as Minolta always did interesting things (wireless flash and off film E-TTL years before anybody else) it's not going to topple Canon or Nikon, because of breadth of range, quality and sheer fanboy loyalty.