I was there too, and altough a fair comparison wasn't possible due to different amps, i came away with the conclusion that they are all great sounding headphones.
I don't know about you, but to my surprise, i wasn't bowled over by the Stax 009, maybe my expectations were too high, after reading nothing but great things about them. they're great sounding headphones, but the others held they're own very well, and had a much better price performance ratio.
I liked the stax sr007mk2 more than the 009 on the WES and so did a few other friends
You could have moved the headphones around to use with the different amps.
I heard about your adventure from one of the Official Anime Thread posters. I think the SR-007 MKI (or MKII if MKI is unavailable) will be my end-game headphone; SR-009 is way too expensive and not worth it from what you and that other user said.