Saw it in Dolby Cinema which, I think, is an IMAX competitor.
I watched it first on a smaller theater screen, and found I was much more able to focus on small details and contrasts. I enjoyed the IMAX version a lot less: sure, you are immersed in the movie, the soundtrack is terrific (and sounds less out-of-place sometimes). But I found it hard to focus on the movie, being reduced to a passive viewer.
I just caught a lot more details in my non-IMAX screening, that I completely missed the second time. When I recall scenes, I think those are from my first screening. I admit I don't know if my opinion were reversed had I seen it on IMAX first, but overall I'm not sold. Plus the ticket was more than twice the price (which I gladly give to fund the second movie -- I wish that made "pirating" legal for me).
i'm seeing a lot of bad reviews from people who obviously watched it at home on a mediocre TV set in a living room. this movie deserves better.