It appears that Xbox One players got a slightly inferior version than PS4 players of Techland's Dying Light, although it seems the difference is very small. Digital Foundry tested both console versions of the new zombie survival game, and concluded that the PS4 version runs at the Full HD resolution - 1920×1080. The report is still not conclusive on the Xbox One resolution, although Digital Foundry suspects it runs at 1536×1080.
The same test seems to indicate both versions are capped at 30 frames per second, although the Xbox One version appears to dip below that more often than the PS4. Not everything is worse in the Xbox One version, as it supports better anisotropic filtering, allowing for sharper textures.
All this is technical details - most players won't notice the differences while playing. Still, for those who love this comparative side of video games, Digital Foundry will be providing a more detailed report soon.