Pacific Rim made $411 million world wide. Godzilla, at last check, is at $323. So, $90 million among the falling current regions, with it still to open in Japan and China. Is it going to slaughter Pacific Rim's worldwide gross, but I'm pretty certain it will beat it.
Of course, the important number is that Godzilla has already grossed $50 million more than Pacific Rim domestically.
I have observed Tohokingdom for a while now. All I have to say is, that the fandom is... interesting. I think it is has to be that there are many different takes on Godzilla, that it is hard to have one defining trait. And with all those different opinions, held by passionate people, leads to very nasty fights.