The third time I saw it was 2D, 35mm, and constant 2:35:1 throughout. With all the screens in my area going digital, it's been a while since I've seen print wear and reel changes! Fourth time was Digital 3D, non IMAX and also 2:35:1 all the way.
It's not a "throw stuff at the camera every five minutes" kind of movie, but what effects there were worked for me at the IMAX screen I saw, and when I saw it later at another screen in the same multiplex. I have to wonder how many digital 3D venues haven't been calibrated/maintained...