1)I won an MvC3 Tournament on their setup and never had lag problems
2)"from what i've seen" is not relevant...you have to try it...anyone can say "from what i've seen"
the LCD that has MvC3 on it (the one with the madcatz panel) has at least 8 frames of lag. the one with MK9 (where SF4 arcade used to be) does have a bit of lag to it.
the players that go to JG all the time are used to the lag so they don't say anything about it. i asked the attendant about it and they told me "so what"
some of the players from the past MvC3 tournament have complained about this situation and have been ignored. and a few of them where forced to play on that station even after they expressed the situation to the TO.
i'm not trying to talk shit about you or JG i am just stating facts. i still go to JG during the (for super turbo) week when i have time. i just will not touch the MK9 or MvC3 stations there.