Is the EM5’s Miss-Stated ISO concerning to you?

DonSantos wrote:

... its not diffucult for dpreview to use a light meter to control their lights. that way we can get accraye comparisons regardless of iso.

Detail Man wrote:

(1) I assume that DPReview records are kept (measured independently from model-to-model varying camera-metering readings, and measured using a separate light-meter) of the illuminance of the test target at the time of performing the individual tests.

(2) Can it be assumed that the amplitude-scaling of RAW image-data in versions of Camera RAW used to convert the GH2, GX1, G3 and E-M5 RAW image-files has been controlled and consistent ? All that I need to know is the ratios between the amplitude-scalings in each of these specific cases