Copy and pasted from NeoGaf:

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 to 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.

http://www.polygon.com/2013/11/5/5052646/call-of-duty-ghosts-review

Please, for the love of Cod (see what I did there), just stop.

Both versions look better than current gen, respectively.
It doesn't matter which is smoother, and which is 720p upscaled, just play the game on the console you want. I guarentee nobody will notice the difference unless comparing side-by-side under a microscope.

Seems like they should have just left the PS4 version at 720p, and saved the framerate....

Anywho, good to see that it plays and looks well pm xbox one, are you picking this up?

I'll wait for more reviews. Videogamer had something different to say about it.

http://www.videogamer.com/xboxone/call_of_duty_ghosts/features/article/xbox_one_review_call_of_duty_ghosts_and_battlefield_4.html

The game lags and dips frame rate on PC, go figure. Activisions are scumbags, I almost bought into it after all the hype. My steam friend bought it day one, its badly optimised, graphics looks no different from last gen, has no fucking FOV slider (WTF?) and lags every 3 seconds on the menu.

Avoid like a plague, you don't want to encourage this sort of behaviour from the dev and publishers.

Polygon.

Naaa I'll wait for Digital Foundry final veredict.

lol Polygon, the company funded by Microsoft is saying something positive about them. Wahahaha what comedy!!

"It's possible that the PS4 version looked somewhat sharper, but that may have just been my imagination after confirming the hard resolution difference."

er..what?

oh right, I see. 

They did such a commendable job with Battlefield 4, didn´t they?

When you have to zoom in at lines at the background of still frames is the only honest way to tell which version is clearly superior, isn´t it?