I've uploaded some test footage from the new Panasonic GH3.
The first portion of the video contains fairly even lighting with tests from f2.8/ISO 200 - f16/ISO 6400. The second portion introduces a hot spot via a desk lamp. Test are from f4.0/ISO 200 - f22/ISO 6400.
Gradation looks very good in the bright areas of the footage. Blacks are fairly consistent throughout. ISO 200 - 800 appears damn fine, as far as noise is concerned. ISO 1600 fairly good and easily workable. ISO 3200 is usable. 6400 is useless.