Every Dev with any Balls has said this from the day they actually got in and started programming.. Either under their breath or out and out in a a blog (which all are carefull to point out is not an OFFICIAL statement, cant piss of one side, it still might win) Now that they use the same "basic" architecture, pure Hardware speed is the difference maker.. the PS4 is at almost always 1/3 faster, in some instance almost 1/2.
Till we see games, compare um, who cares.. Devs will program to strengths. One will lack 2 clouds in the background, 10 miles off and all the sudden the other will be better..
look at the good news, they are supposedly pretty close to program for, we wont see the early crap from devs like we did on the PS3 (sorry, its just a fact the 360 had the better cross platform games in the early part of last gen) I suspect the One will be the lesser to start this gen if all the devs are correct with their assessments of the new consoles, big deal, they will figure out how to make it compete in some time. NO dev in his right mind will make a game way better on one console then another, that would alienate them one of the big 3, (big 2 if you are talking high end) and who knows who will win the next gen (or this one even).
own both, IF MS can stick with there newly adopted stance on USED games.. I will own both again. No way Im paying $60-70 a game..