Unfortunately, none, I haven't seen any of the HD broadcasts. What I did, do, however, was pop in the 2006 DVD set into my PS3 after lugging all my goods home from the show, while it was fresh in my head (hardly scientific, I know).
Seeing the DVD again, I thought it looked much darker, but everything else (the mattes, etc.) looked the same, of course.
It's hard to judge much under a full ceiling of harsh fluorescent lighting, but I still think the Blu-Ray looked good.