JackFrags has experienced it all and shares his thoughts on how Battlefield 3 and 4 play and look on the 360, PS3, X1, PS4, and PC.
Side note: At the end of the video where the train is pushing the tank around ... yes, the train is an objective, and it moves towards the deployment of the team that holds it, making it easier to hold.
http://www.youtube.com/watch?v=GDGAvdJ9PHQ