I post some measurements I made using Imatest and one of my CC cards.
From left to right:
ACR 4.6 - Adobe Standard - Calibrated using CC Passport software (elinchrome flash used)
To me it seems that Caucasian skin tone, top row second, is pretty similar between all. May be I should have used "old macbeth card as reference", but primary testingdoes not really indicate that it would matter.