I noticed two things, which came unexpected and are disturbing in my point of view. That is, unless I am mistaken or did something wrong...
1) [Artist] does not retrieve the artists if separated with a semicolon
When I use the [Artist] field, e.g. in move, rename, copy, and the artists are separated with a ; then I only get the first artist. If they are separated with other characters then it works. I've read something, that this field, like genre, is actually a list field now and just looks like a string field, where ; is the list separator. So be it. But IMHO that cannot be the intended behavior. Even as a list the [Artist] field should return all artists. Furthermore as I could not find any other field or method to retrieve the full list of artists.
2) Quicksearch for artist (sorry, have no idea how to name this better)
What I mean is the little arrow in front of an artist name (also album and genre have this). If you click on that then the search field is pre-filled with the artist and I see all songs from this artist. Or so I would think. But this is not the case. Because in some cases, where an artist is listed as the album artist but not in the artist field itself, this will not show up (e.g. George Micheal's album 'Five Live', track 6 'Dear Friends', where this is performed by Queen only. If I click on the little arrow in front of 'George Michael' the song disappears/does not show). This is somewhat unexpected and confusing. Even more so, as if I type 'George Micheal' manually into the search field, the song does show up. So, in both cases I will see 'George Michael' in the search field, but the results are different. So I'd think that "Quicksearch" for an artist should also take the album artist field into account.
If you want to make me happy, then please tell me that these two issues are bugs and are corrected soon...