http://www.videogamer.com/xboxone/call_of_duty_ghosts/features/article/xbox_one_review_call_of_duty_ghosts_and_battlefield_4.html
"Battlefield 4 on PlayStation 4 looks stunning, with DICE clearly utilising the console’s additional firepower to yield a superior image quality on Sony’s machine. Images are pin-sharp, reported to be running at a native 900p and fluid 60 frames per second.
But while the Xbox One version effortlessly maintains the same frame-rate, the image quality is perceptibly worse, sporting a softer, jaggier look that carries all the hallmarks of a game upscaling from a sub full-HD resolution. Technical comparisons claim that the Xbox One version is rendering natively at 720p before upscaling to 1920x1080 (a suspicion I also share) although DICE opted not to confirm numbers when confronted about the resolutions of the two next-gen versions directly. "