I struggle a lot with the Canon 5D Mk II skin tone. With senior people I get too red skintone, and beautiful children summer teint gets transformed into artificial sunburn.
The resolution to the problem has been to import other cameras ACR profiles via the ADOBE DNG Profile Editor and export them as new profiles to Lightroom.
This is the result with only Brightness B being modified. I like the Nikon D3X profile best. The Minolta and Sony results can be easily beautified. In DPP I had to reduce the contrast in order not to exaggerate the reds.