Hello. You might have missed my comment, because I'm new and it took a day to post (1st comment needs approval). So I'll re-post it here:
The whole thing about .25 for China, .4 for foreign, and .5 for domestic box-office....you can throw all that out-the-window for billion dollar blockbusters. The worldwide-gross is the best way to estimate profitability. Simple.
The studios (especially for blockbusters) negotiate private deals with China. Releasing first there, plus Wan as director, probably got the % up to 40. And...studios get front-loaded $ from domestic theaters, meaning that the % for the studio usually comes down on billion-dollar blockbusters. So foreign/domestic evens-out.