I wouldn't trust early impressions of new headphones that much. Especially not ones that cost over a grand. Almost everyone that has heard them just spent a huge amount of money on them and has a strong confirmation bias to like them. If you read between the lines - they sound bright. Someone said the other day the Omega are less fatiguing in the highs... have you ever seen an FR graph for an Omega?
All speculation of course. Here's hoping the SR-009 come to a UK meet soon. Mark from high end workshop always seems to have the new Stax' as soon as they're released so there's a good chance they'll come around soon.
Re the HD800
I guess it depends on what you play on them, I listened to something with electric guitars that kept hitting that peak and attacking my ear drums, then I listened to some stuff with brushes on snare drums and cymbals and it sounded like an annoyed librarian -
Most of the tracks I tried out on them hit that peak a lot, but if you're lucky enough to listen to a track that misses it from beggining to end, maybe they would sound neutral.
The lack of sub bass foundation also adds to it a fair bit IMO...