There is a night and day difference between the WiiU and Xbox One, not only in terms of performance but in sheer capability too.
MGS:GZ is probably a bad example of a game that pushes hardware, the assets are pretty much the same across all platforms be it last gen or current gen.
The power-gap between the Xbox One and Playstation 4, really is, in the grand scheme of things... Insignificant, next to the glorious ever-improving power of the ultimate platform... The PC. - All your games are belong to us, eventually.
--::{PC Gaming Master Race}::--