PS4 seems like a 600-700 PC rig to me.
Would that PC have hUMA architecture? I believe this will set the PS4 apart from the crowd if properly utilized.
Also...will that PC be so standardized that programmers can more-perfectly code to the hardwares full potential? Consoles always outperform their replica PC counter part due to the programming that is able to be written for each. As to how much value that adds...who knows.