interesting article on the whole xbox1 vs. ps4, it is predicted that the ps4 will be 50% more powerful for gaming, due to the route MS took to make the xbox more of an entertainment device, MS might be trailing a bit this time around......
http://www.eurogamer.net/articles/digitalfoundry-spec-analysis-xbox-one
what i found interesting was that its using 2 virtual machines inside to do all the multitasking between gaming and tv etc, so its a virtualised pc running a hypervisor.
In all the videos and reviews I've seen there's nothing to separate the One and PS4 - although someone at MS did sort of say they didn't make the hardware as top notch as it could have been as it would have been too expensive.
After the promises of the PS3 that it would rule the world I take it with a pinch of salt