Sony has just announced  the world’s first full-frame interchangeable lens mirrorless camera with autofocus capabilities, adaptors for other companies' lenses (that means manual focusing) and with 24 MP and 36 MP sensor (without an optical low-pass filter) ). The cameras (the Alpha7 + Alpha7r ) are  weather sealed and   the  price tag is $US1700 and $US2300 respectfully. These are smaller, lighter and cheaper than a DSLR and they have comparable image quality. 

Those, like me, who have Leica lenses but shoot a film Leica and refuse to pay $7000 for a Leica M, here is the option: the 36MP A7r with the best sensor tech of 2013.  For those  like me with Leica  glass, we can now mount our Leica glass on a high quality full frame body with the best sensor tech of 2013 inside the camera without spending $7000 to do so. An M body doesn’t make any economic sense.   

It is what I have been hoping and waiting for.The 36MP FF sensors, with the right lenses, are pretty close to entry level MF ---on resolution, but not tonality. This is a step up from the  NEX-7, which I have been  using  with Leica lenses. It is a disruptive product  that will challenge the historical legacy and inertia of Canon and Nikon, who have slowly  been losing market share. 

One problem here may be that  24MP is at the limit for consistent pixel-level sharpness and hand holding. With 36MP FF sensors you need to to work with high shutter speeds, on a tripod, with lights, or all three because it is very difficult to extract the full 36MP all of the time.