^^ - second this. My 009 sounds close to perfection on my KGSSHV - definitely no strident highs. (Though I've heard it even better on a BHSE).
(But then, I never found the HD800 to be harsh as well. I love the HD800s with my current B22 (4channel balanced), and I've heard it even better on the GSX MKii).
As usual - YMMV (variables include source, clean power, cabling etc.)