Official: Voigtlander 15mm f/4.5 III E-mount
I was looking at this one with interest but no reports I know of
http://www.amazon.com/Fotodiox-Stretch-Adapter-Ability-Mirrorless/dp/B01E0I1UZ6/ref=sr_1_31?ie=UTF8&qid=1462724094&sr=8-31&keywords=leica+m+to+sony+e-mount+adapter
Features
Revitalize your Leica M mount glass with this DLX Series Stretch Adapter from Fotodiox which not only lets you use the lenses on a full-frame or APS-C Sony E-mount body, but offers enhanced focusing capabilities. This adapter features a focusing helicoid that can move the lens farther forward while attached, acting much like an extension tube to shorten the minimum focus distance of the optic. This system can also reach further back towards the sensor, guaranteeing infinity focus with nearly every lens. The brass and aluminum adapter also sports a focusing tab to make use much easier.
http://www.amazon.com/Fotodiox-Stretch-Adapter-Ability-Mirrorless/dp/B01E0I1UZ6/ref=sr_1_31?ie=UTF8&qid=1462724094&sr=8-31&keywords=leica+m+to+sony+e-mount+adapter
Features
Revitalize your Leica M mount glass with this DLX Series Stretch Adapter from Fotodiox which not only lets you use the lenses on a full-frame or APS-C Sony E-mount body, but offers enhanced focusing capabilities. This adapter features a focusing helicoid that can move the lens farther forward while attached, acting much like an extension tube to shorten the minimum focus distance of the optic. This system can also reach further back towards the sensor, guaranteeing infinity focus with nearly every lens. The brass and aluminum adapter also sports a focusing tab to make use much easier.