I've compared 0 and 1. There is no difference when you fight an enemy. On 0, I've taken out Reborns with one good, clear swing from Medium.
I've faught against Tavion on both 0 and 1. I tested out the ol' hold-up-with-choke-throw-saber combination, and she went down in the same ammount of time on both 0 and 1. I basically had to do the combo twice before she was finished.
And my name is "Janson", not "Jansen". ;-)