Comment on the forum Note: My camera is running firmware version 0.2! If the performance changes when updated, I will re-do the test Does the Panasonic GH5S finally achieve full-frame like performance at ISO 12,800 against the best of the competition? Here I put the little nocturnal fox in the ring with the Sony A7R III, A7S II, Nikon D850 and the plain old ‘non-video-orientated’ GH5.