While the Xbox One version of Call of Duty: Ghosts has been confirmed by Activision to run at a lower resolution than its PS4 counterpart (720p upscaled vs. 1080p native, respectively), that numerical difference is less meaningful than you might imagine.
The two versions look nearly identical. Viewing the Xbox One release next to the PS4 , I had difficulty telling them apart. It's possible that the PS4 version looked somewhat sharper, but that may have just been my imagination after confirming the hard resolution difference. The next-gen releases of Call of Duty: Ghosts are so close together that gun to my head, I'd have no confidence in being able to discern which version was which — at least, while the two are standing still.
The Xbox One release's framerate was far more noticeable. As mentioned in the initial review, Call of Duty: Ghosts suffers from consistent framerate drops on the PS4, especially during multiplayer when action got especially hectic. The Xbox One version suffered no such drops, maintaining a steady 60 frames per second throughout.
For a multiplayer shooter, framerate consistency is paramount. Given its relative visual parity with the PS4 release, Call of Duty: Ghosts is a more playable, slightly superior (albeit disappointing) game on Xbox One.
xbox one: 7.0
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Another thing that is still a "rumor" but confirmed by actual inspection:
So much for 50% more powerfulCode:single player on xbo 720p (with stable framerate) multi player on xbo 720p (with stable framerate) single player on ps4 720p (with stable framerate) multi player on ps4 1080p (with unstable framerate)