Getting a Sony over an M9 is a no brainer. I had the M9, made some good images with it, but after a while sold it for the same reason I sold many other cameras, too heavy, too bulky, too much money for what it does and not reliable. Sony A7 seems to me, is more in line with the original leica film camera philosophy, light weight but well made, small, easy to carry everywhere, the only negative is the shutter noise, but I can live with that. The fact that you can adapt any lens ever made is just spectacular. I already bought a whole set of contax G lenses, with a metabones adaper on the way.