Konami has confirmed that in terms of looks, Metal Gear Solid V: Ground Zeroes will be better on the PS4 than on the Xbox One.
The news came as an official post so there's no bickering to be had by the graphics-pathological fan-folk. Konami says, " --- ". Yup, nothing.
In terms of the technical, both Xbox 360 and PS3 use internal upscaling mechanism to reach 720p and run at 30fps. Both PS4 and Xbox One will run at 60fps, with Xbox One running at 720p and the PS4 at 1080p.