I don't think it is fair comparing any console to a PC. Consoles have set hardware, PCs are as good as the money you throw at them. The two technologies are totally different and it is not viable to compare them.
It's only really viable to compare two systems that have set hardware. PC technology is modular by design, and that means just about every PC is going to be slightly different.
I do however agree with Vimacs that the PC will always beat any console in terms of raw power. But I don't think the PC always has the better games.