Here's a quick look at putting a 4/3 Lumix 14-50mm lens on a Micro 4/3 GH4 camera using an electronic adapter.
This means the Micro 4/3 camera can fully control the 4/3 lens, including auto focus, image stabilization, lens correction, and manual focus assist on the camera happening automatically.
Lens adapter here: http://amzn.to/1TfW3DZ