As we write this conclusion, Panasonic has just taken ... the G9 was lab-tested with a new lens, so it has a slight advantage over previously-tested MFT cameras in that respect.
The company lists about 30 lenses on its site, all using the Micro Four Thirds mount ... and a more basic 35mm f/1.4 full-frame lens. Panasonic's Lumix cameras use the L-mount system.
The Olympus E-P3 is compatible with any Micro Four Thirds lens, with Olympus and Panasonic together having shipped a total of twenty five lens models at the time of writing (December 2011), or ...