Originally posted by TonyW
Having used both I have not seen the behaviour you describe although I must say I prefer the Adobe DNG profile editor for the capability to tweak the profiles to taste.
we are talking about different things now. the OP was about accurate color rendition. Tweaking profiles to your taste is not a way to get accurate color.
you can try different workflows and see it for yourself:
1. xRite Colorchecker + Pentax PEF => ACR, export to DNG => xRite Colorchecker Passport
2. xRite Colorchecker + Pentax DNG => xRite Colorchecker Passport
3. xRite Colorchecker + Pentax DNG => Adobe DNG profile editor
the problem with oversaturated reds usually occurs when you are using workflow 2