Heavily ABed HD800s in both the Headroom and TTVJ rooms. They will be grail to some people, but I would not consider them delivering everything possible in a headphone. For instance they are not as bloomy as the top end Grados (PS1000 or GS1000 for that matter). They do present a stage and a "3D" presentation to me no other headphone can touch or really even comes close to. Things are bigger, fuller, but still very focused with a lot of detail. Not an easy feet. What also impressed me was that they are able to portray frequency extremes with far more range. Meaning that a bright CD is bright and a non bright CD is not, same with the bass. Hence you will here that HD800s are bright, not bright, not bassy, too bassy compared to xyz. It will depend on your system and music. Some people I guess call this "transparent"; or at least it is a form of it.
PS1000s, had them compared to the GS1000s and HD800s. I will say these are a less bright and much fuller version of the GS1000 sound. Everything the GS1000 needs I guess. Heavy though. If your tastes are to the Grado sound these can trump the HD800s (which my friend thought they did). Still compared to the HD800 the overall sound is not quite as refined to me. I can still hear the peaky edges of vocals that appear on PS1000 (and especially in the GS1000) that do not appear on the HD800s.
Those are the main things I wanted to cover going to Canjam. May try back tomorrow and listen to a few more things.