First test Panasonic GH2 with Rokinon 85mm F1.4 @ F1.4 , 160iso, 1/50 sec in 1080p24 24H 24mb/sec mode. This was in total darkness of the dash in my 2010 Honda Fit Sport.
The 85mm F1.4 has an aperture ring so you could change it during manual video mode and I did focus it manually during that test clip. I have a Pentax PK-m4/3rds adapter.