Introduced: 2014
Lens mount: Micro Four Thirds
Sensor: 16 Megapixel, Micro Four Thirds
ISO: 200-25600
Continuous Shooting: 12 fps (mechanical shutter) / 40 fps (electronic shutter)

More info:

https://en.wikipedia.org/wiki/Panasonic_Lumix_DMC-GH4

Review:

http://www.photographyblog.com/reviews/panasonic_lumix_dmc_gh4_review/

https://www.dpreview.com/reviews/panasonic-lumix-dmc-gh4

http://www.imaging-resource.com/PRODS/panasonic-gh4/panasonic-gh4A.HTM

Manual:

http://panasonic.ca/viewing/ALL/DMC-GH4P/OI/vqt5h68/vqt5h68.pdf

http://panasonic.ca/viewing/ALL/DMC-GH4P/OI/vqt5h96/vqt5h96.pdf

http://panasonic.ca/viewing/ALL/DMC-GH4P/OI/vqc9858/vqc9858.pdf