GH3 = attempt at Photographic Dynamic Range

Hmmm. Looked at the ISO=125 and ISO=200 RAWs. RawDigger reports no black-level subtraction being used whatsoever(?), and shows a very clean noise distribution (all in the zero bin, not a thing in any of the higher bins). The Standard Deviation is (in both cases) somewhat higher than that of the EM5 (at base Sat ISO=107) and the GH2 (at base Sat ISO=167).

(Manufacturer rated) ISO=125 ~ 1.3 ADU

(Manufacturer rated) ISO=200 ~ 1.1 ADU