Godzilla killing the American Zilla in less then twenty seconds is flat AWESOME.
Hell, the whole montage of Godzilla walking around owning every monster that he comes across is awesome, especially when you consider that the monsters have all single-handily overwhelmed Earth's defenses. "Last resort" indeed.
For fans of Zilla, seeing him in a japanese Godzilla movie at all is pretty awesome.
The mutant soldiers taking down Ebirah is one of the few times humans actually take down a kaiju, and it is awesome.