Likely, a decently built but fairly expensive PC, even right now, will outperform even what will be the newest of the new for consoles.
The biggest argument for that would be that consoles are made for low-range/mid-range consumers, in the long run, not using top of the line enthusiast hardware, because doing so would make your new console cost more than some used cars. On the other hand, in a PC, due to the modularity of the system, not every part needs to be top of the line to make a decent machine, and if new parts become available, chances are decent that it can be integrated into the existing system.
So, however powerful they are, not as powerful as a well built PC is today, most likely.
For actual game market, one of the consoles may very well be better, due to exclusivity and the fact that some of the more well known games are built for consoles and only then ported back to the PC. Furthermore, ideally a console would ensure that all games ran more or less exactly the same on each system. This isn't true of a PC, of course.
But if you're interested in computational power, consoles are almost never a good decision.