Dxomark "measured" ISO vs Manufacturer ISO

I strongly urge you to read these fine articles from Luminous-Landscape:

http://www.luminous-landscape.com/essays/dxomark_sensor_for_benchmarking_cameras.shtml

http://www.luminous-landscape.com/essays/dxomark_sensor_for_benchmarking_cameras2.shtml

And specially these excellent articles over at TOP:

http://theonlinephotographer.typepad.com/the_online_photographer/2012/09/why-iso-isnt-iso.html

http://theonlinephotographer.typepad.com/the_online_photographer/2012/10/raw-is-not-raw.html

Long story short, though: you and DXO and DPR are all correct. Yes, simultaneously. The subject matter just happens to be weird like that.

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