How do these compare to hd598?
In my opinion the X2's way superior in almost every aspect. The HD598 holds up well when it comes to soundstage width and its midrange is more forward but apart from that it does not offer much over the X2's for me. The X2 has better dynamics, better soundstage depth and height, has much better 3D presentation and timbre to the notes. None of them are excellent in clarity.
Overall I find the X2's to be a lot more engaging and enjoyable.
I find them both to be very comfortable but the X2's are a good deal heavier.
As always ymmw