By contrast, artist names are handled correctly. This is most visible for artist comments like 'performed on track "foobar"', where tooltips get will get cut off by the quotes.
And example of both artist names and artist comments with quotes in them would be http://musicbrainz.org/release/cd4bb05f-7768-4864-8c7e-14c51e79e34e, tracks 4 of both discs respectively. Just hover the artist names.
This issue could affect other fields as well, e.g. release comments.