Yes, I’m aware companies make that “secret sauce” and IMO, Canon is known for a great skin color, just like Olympus has been known for fantastic blues, out of the box. But alas, only Canon’s own DPP really reads ALL Raw values accurately. Not surprisingly so, considering it’s their native tool.
However, I’m on a mission to create several profiles for RT, depending on the light or skin colour conditions. While it won’t be 100% accurate, it will be close enough and much better than default one.