With M-to-E adapters, you can easily use any Leica lens with an M mount on your Sony cameras. And if you have $10,000 to spare and want to buy the best 35 mm lens on the market, you can pre-order the new Leica Noctilux 35 mm f/1.2 lens from BHphoto (Click here).
Stunning lens for a stunning price :)

