PS4 is 50% faster than the xbox, confirmed by the Devs who have received their tool kits. Whats the worst that could happen you say? Oh, maybe Call of Duty playing at 720p instead of 1080p on release.
I don't measure the winner by which hardware is the fastest. Steambox may be a success one day and it will have nothing to do with having the fastest hardware. I prefer whichever system gives me the best social gaming experience.
