The first time we had a tournament with big japan and US players playing was EVO 2k2. Japanese players placed 1st, 2nd, 3rd, 4th, 5th, 5th. US’s top placings were Alex Valle and John Choi who both placed 7th.
The US never really played Japan without roll cancel… but I doubt the results would have changed. Ino placed 3rd after all with k-groove.
I believe Spider-Dan played either Liquid Metal or Bas at XvsSF. I think US won most of the games. I’m not sure though so perhaps someone else could confirm. It was casual though, but it’s the only thing that’s available.
Also, it’s tough to actually gauge the competition based on videos. I remember when the US thought Japan was a threat for MVC2 just based on their combos that they were doing in the videos… but it turned out to be an easy victory for the US.
About WW-HF I don’t really know who was better. I’m pretty sure it’s a safe bet to say Japan but again, there isn’t any proof so I can’t say anything for sure.