I will say this about it, I like the graphics much better than BF3, meaning, I can see more clearly.
yeah they changed the graphics up a lot in the sense that they don't have this weird tint over everything. like grand bazaar looked blue and some of the aftermath maps looks orange. now things look a lot brighter and more vivid so it's a lot easier picking out soldiers out from the background. the maps themselves are a lot better thought out and much more balanced and open. no more fawking choke points like metro. oh and they're dynamic too. i'm so happy they brought back destructible environments and also these huge "levelution" events.
also, a lot of things like suppression and random bullet deviation have been reworked so gunplay is a lot better too. so there's that.