I can get 50mb via my wifi, with higher quality videos i can hear the sound while playing but video just does not move, but there other videos available that will play, for example i got some videos i took with my n95 and those work fine.

Vimeo does also offer the original file to download but you need to login, but that file normally is even higher quality then the embeded one.

would be interesting to see if any phone will be able to handle it.