Title says it all. This is the question I think.
This year we had COD Ghosts (720/1080) AC4 (900/1080) and BF4 (720/900) show notable resolution differences, even if no real graphical differences. Three of the biggest recurring franchises in gaming.
Many other games like NBA2K14, Fifa 14, and NFS Rivals were 1080P on both and nearly identical. However note these were somewhat less demanding games arguably.
So will the gap close or grow in 2014?
I definitely say close. I even venture that eventually all major multiplatforms will be the same resolution on both.
I think developers will learn the Xbox better, with it's more complicated ESRAM setup it will take more time to learn. In addition, I feel MS will streamline the XBO drivers and reduce OS reservations to gain more performance (because they have to, lest be mocked by PS4, I imagine this is an area of concern within MS and thus they will work hard on it). Thuway says a January XBO update already gains 10% performance. Plus, the usual way of multiplatforms is parity, it's always easier on the developer (note even 2013 XBO versions with less resolution are otherwise mostly identical graphically to the PS4 versions, proving the point of so called "lazy devs").
