DPReview Gear of the Year Part 2: Panasonic Lumix DMC-GM1

Ricoh doesn’t use m43 sensors AFAIK, so that would probably have to be an APS-C camera. Because of the sensor size and the f/2.8-4 you want, that lens would be a LOT bigger than the GM1 zoom …

Source Article from http://www.dpreview.com/news/2013/11/20/dpreview-gear-of-the-year-panasonic-lumix-dmc-gm1