Yeah, vocals of all types are gorgeous on HE500s. Maybe not the most super detailed but they are presented in such a great way with believable texture you don't care and you
just soak it all in (and some of those details on some recording can show up as grain).
And, off topic a bit, but it's a similar story with the bass; I crave the bass on the HE500, again not as detailed as some other phones but fast and subjectively sounds
subterranean deep and harmonically great, not overblown or out of control like some other phones do (like JVC DX100s, Grado PS1000s, or Denon D7000s).