http://www.eurogamer.net/articles/digitalfoundry-2014-metro-redux-performance-analysis
Summary:
				
			Summary:
- PS4 - 1080p
 - X1 - 912p
 - Both hold 60 fps well
 - Pixel crawling more prominent in X1 due to lower resolution; otherwise PPPA, assets, texture filtering, draw distance etc seem to be the same across the board
 - I spotted crushed blacks in the X1 version which seem more prominent indoors, wasn't mentioned in the article
 - 4A uses the DS4 lightbar to emulate the protagonist's wrist watch indicating visibility to enemies
 - Separate article will deal with PC