U.S numbers are inflated too.
Anyways, the biggest economy in the world is China, so I guess economically they're the superpower, however this is a new era where economic and military might won't be hand in hand, first time in history, so we have to be more specific. Do you mean influential globally? They are equal, China takes a more hands off approach, whereas America uses might (see link below on why). Militarily, America is the superpower, China is the financial superpower. China can punish America financially, it's the only country in the world that can do so, but America can't flex on China militarily. It would be a nuclear holocaust. Nuclear countries
can't fight each other. They can only use chess moves using money. Like what America is doing to Russia. China is different because it manufactures everything for the entire world, you just can't do shyt to them, they'll block everything made in your house from entering your country LOL. You ever notice western countries bark at them, but they don't actually do anything. You will never see sanction going in China's direction, not like the ones done to Russia, its literally impossible.
If you want to know how China will conduct its newfound superpower status, check out this speech.
The way he shyts on cacs
http://en.wikisource.org/wiki/Sun_Yat-sen's_speech_on_Pan-Asianism
ps. The chinese will never have a high GDP, because the whole idea is to make money by producing extremely cheap goods, they're approaching economics in a totally new way which confuses a lot of westerners. Its just now that American Economists are realizing this and wanting them to make the Yuan stronger, problem with that is, it will make all of your goods more expensive, and that would make folks all over the world pissed off. Its was a very very clever chess move on their part, but meh, I guess asians really are good at math.