As noted in my above post, Sweden and Finland are really not socialist at all anymore, they have really embraced free markets and free trade.  They still have high taxes and lots of government-funded services, but government does not control business much (if at all) more than in Canada.

Canada also is definitely not a socialist country by any stretch.  We might have some small bits of socialism, but by and large we are a capitalist society.  Denmark and especially Norway edge a tiny bit further toward socialism.

China?  They abandoned socialism in the 1970's.  One could potentially make an argument that they are an example of fascism working well, though even that would be a stretch.

As for the U.S., they definitely aren't very capitalist, certainly no more so than Sweden or Finland are these days.  If you want the "most capitalist" countries you'd do better looking at Switzerland or perhaps Singapore or Hong Kong.