Joinning the club guys, just recieved my HD650s yesterday (bought them used) and the first I played on them was Mozart, this LugBug1 post is really accurate IMO.
I'm becoming more convinced that the hardcore 650 admirers are more music lovers than sound quality fanatics. That's how it should be! We are a more relaxed crowd, chilling with our 650's on ha ha. There's no sign of any sibilance here!
I'm chilling right now listening to a Beethoven string quartet, and I couldn't give a monkeys about the bass, treble or mids.
Just enjoying the music. (oh yes and writing this too..)