Dynamic vs Baked is a huge difference in processing. And I'm quite sure that the poly count in the car models are less than DC (another way to tax the hardware less to hit 1080p).
All 1080ps are not created equal and again if these games can do 1080p60 on the Xbox One, it can EASILY do it on the PS4. Not so much in reverse.
Enjoy
Wait did this dude https://en.wikipedia.org/wiki/1080p