No, I maxed everything up to ultra IIRC. My resolution is 1920x1200. I'll take a screenshot if you want. I'd say try playing with the anti-aliasing. As has been said already here it may be worth it to tone those down (you won't see much difference), which I have done too so maybe that's the difference.
I think the real test will be the final game, hope the 570 and its 1 gig of VRAM will be enough to really max things out (then again I am not too bothered, it'll still look great).
1) Take a screenshot of your in-game video settings menu after you restart the game if you have made any changes to it.
2) Run Fraps benchmark for 300 seconds (5 min) when the round starts and for the second time when it gets to the underground stage.
3) Post minimum/maximum/average fps.
I'm afraid most people don't know how to measure the fps in games.