No it will be the same movie with the same story.
If its my first viewing then sure I'll go for the best available, but once I've seen it what good does IMAX add?
If you are a film buff or otherwise appreciate the quality of visuals, a full film-derived experience, as in shot on film and projected in film, is a level of visual quality and immersion that remains unrivaled to this day. Technically they sort of cheated with the non-IMAX scenes (those shot on regular film), because they scanned those into digital, upscaled to 6K and then processed that onto IMAX film for IMAX projectors. I don't know if they also do something similar for IMAX when down-converting to 35mm prints, but, and this is just my theory, a 35mm print might have the strongest film-quality visuals for the majority of the movie, though they would pale in comparison to a 70mm projection when showing the true 70mm print images. Truth is though, that digital conversion from film source will still be a better digital image than that from an all-digital capture solution.
Another thing, if you go to a good IMAX theater, you'll get a larger projection screen that will still have sharper images, stronger contrast, and better color quality than any smaller projector elsewhere. No 4K or better projection system can match what 70mm film can produce when given the beastly Xenon lamps, no... mini-suns that sit behind their projectors.
The biggest thing is, if you appreciate filmed visuals, the absolute contrast levels blow away digital, and the tonal and color range surpasses the best digital cameras by, well... a lot.
One movie that stands out in my mind as an example of quality 35mm visuals, on a Blu-ray, is that of Children of Men. The detail and contrast were unreal, it had a sense of depth to the point that it almost appeared to have a minimal 3-D illusion, and on my Panny plasma, it didn't necessarily rival the depth of actual 3D content with the glasses, but it was sharper and seemed to come mighty close (this is also due to the fact that the 3D performance of Panasonic plasmas are not stellar, per the word of reviewers who have seen more sets than I).