Capitalism with a human face doesn't make sense. It's like talking about Ethical Theft. It might have served its purpose, but now it's time to move on.
Socialism yes indeed! But to say that China is semi capitalist is seeing the glass half empty; they are still in the preliminary stage of socialism. It's not perfect, but it doesn't have to be as long as it goes above and beyond what has been achieved by capitalism. I recommend The East is still red by Carlos Martinez about that. It deconstructs a lot of misconceptions about what China is and isn't.
There were many experiments; none seemed to be successful, unless you consider the current semi-capitalist China a social success.