Norah Jones' Come Away With Me and Diana Krall's The Girl in the Other Room, for starters. Very well-mastered albums and will give you a good idea of how your female vocals will turn out. Those tend to be harder to reproduce accurately than most.
Otherwise, there's a lot of good vocal processing that went into Daft Punk's Random Access Memories, especially during "Giorgio by Moroder." If you can pick out the subtle differences between all the vocal mics used in that track (models ranging from 1960s-manufactured up to present-day), you've done quite well on the tuning.