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

That is exactly what the OPs DXO link shows...it's normalized so ISO calibration is irrelevant.

DPR doesn't do this, so their results are of less use.    You have to look at their ISO accuracy section of the review and then normalize the ISOs by hand in the comparison tool (which usually isn't possible since the accuracy is usually within 1/3 stop).

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Rick Krejci
http://www.ricksastro.com