From the GH4 Production Diary on EOSHD - eoshd.com/content/12392/panasonic-gh4-4k-production-diary-day-2-test-footage
Download original 4K clips from the GH4 here (pre-production) - copy.com/EoeMcoA2T9L4
Shot in 4096 x 2160 Cinema 4K DCI mode. Academy 1.85:1 aspect ratio. CineLikeD profile for best dynamic range, which is almost 12 stops and is impressive. Graded with Film Convert Pro 2 in Adobe Premiere Pro CC.
Disclaimer - this is a pre-production model with firmware version 0.5 and may not be representative of the final image quality from the camera.