IGN has just posted an updated version of their comparison videos of Call of Duty: Ghosts on PS4 vs. Xbox One. Their older video had an issue that didn’t have the PS4 version running at the native 1080p. Another issue they had was that the Xbox One version had color blind mode enabled, which enhances some of the colors. The new video does have the PS4 version running at native 1080p and no color blind option on Xbox One, and you can see a difference between the two versions.
Call of Duty: Ghosts runs at 1080p natively on PS4, and runs at 720p natively on Xbox One upscaled to 1080p.