ELI5: Why is IMAX film so much better than digital? I thought film is an older technology? Just saw Interstellar in a theater that had actual film projector. It was beyond anything I have ever seen in a theater. To me it was beyond what the human eye can see, which is wonderful - no film grain, no pixels, just the image in a pure form. Why is "digital" suddenly being demoted and film being praised as superior, especially by people like Christopher Nolan? It almost seems like film is being gradually introduced more and more (from the dark knight to the hunger games scenes).

As I understand it, its also nothing like vinyl vs. CD quality in terms of "analogue is always better!" but rather its immediately perceivable. 

It could just be the screen size but to me that's what made it even more impressive. It was this big ass multi-story screen and it was still as perfect as a gigantic crisp photograph.