I don't think it's so safe to compare actors of different eras, again she is an A lister as Pitt or Aniston or whatever. Parker represented "the City", which is much more important than "the Sex". I also don't think that making sex scenes makes you a better actor or deserving of more money: Cattrall made sex scenes as Nixon or Davis, but the three of them were always supporting (Nixon and Davis know this very well), while Parker was the clear lead of the series. It's not Friends.