They kinda reversed it from their performance at the ARIAs. There, Kimbra definitely did the better job while Gotye wasn't quite up there (I believe he was sick...?)
And here, Gotye outperformed Kimbra by quite a bit. i don't know. Both were great, but her vocals were just a little shaky, in my opinion.
Hope they can even it out for the Grammy performance that is sure to come.