I traded my HD800-s for AFO last week, and they should arrive to me next week. When I bought HD800 more than 3 years ago, I just loved them. The clarity, air, separation, big soundstage, comfort. But this year I just had this feeling that maybe too thin sounding, maybe too big soundstage (listened from Gumby/MJ2)? I listen to classical music, but no so much as everything else. So when there is a small band (few guitars, drums, singer), then the large soundstage felt artificial (distance from guitarist to singer is too large etc). At least for me. So I wanted to try something different. Never heard a planar before and I have always used Sennheiser headphones. But if I don't like them, there is always a change to sell them in head-fi and try something else instead.
And some examples about the music I listen to: Albert King, Joe Bonamassa, Eva Cassidy, Mark Knopfler, Eric Clapton, Beth Hart, Bob Dylan, Pink Floyd, Queen, Jimi Hendrix, Neil Young, Norah Jones, Roy Orbison, Florence & The Machines, Simon & Garfunkel, Stevie Ray Vaughan and sometimes 90's dance music and a classical + jazz.