If not Koroliov, the two I've enjoyed most over the years is Reinhard Goebel's and Scherchen's first recording.
I've also enjoyed Marriner (rather edgy), Berlin Saxaphone Quartet and Savall. And Scherchen's
On the whole I have tended to avoid piano or harpsichord versions == I find that there's not enough variety. Gould however is extremely good in the late recordings -- Contapunctus 13 and 14.
Koroliov was a real revelation -- a sort of miracle of articulation: somehow he manages to find a medium between staccato and legato. And a miracle of dynamic control -- he's very memorable at building climaxes. Maybe the pianists here could tell me what piano he's playing -- I suspect it's just a Steinway 88, but he makes it sound very right for the music.
I have some others which I have never really got into for one reason or another: Sokolov, Macgregor, Walcha and Aimard. But I need to give them more time -- Aimard especially has always sounded interested on brief sampling -- but I've never gotten round to sustained critical listening.