Just came back from seeing this a second time and it absolutely held up. Easily one of the best movies of the year so far, and definitely near the top of the franchise for me too, but not at the top (I personally prefer MI1 and MI4 above it). I'm starting to really like McQuarrie as a director and am now convinced that he could direct either a great Batman or Superman movie. Along that line, this movie more than any other of his felt almost Christopher Nolan-like in its style (the combo of camera shots, cinematography, and music in particular reminded me of TDK at times), but at the same time was distinctly non-Nolan, and by that I mean superior to Nolan. It's almost like McQuarrie is what Nolan aspires to be, but is incapable of becoming.
Cavill was sort of a let-down in his role, definitely wanted more out of his character. I really like him as Superman, but that's probably the only role that fits him like a glove. Unfortunately he's clearly not a very good actor. A better actor probably would've been able to have left a stronger impression, and the only reason he left any impression on me at all was because of his [blackout]reveal as a villain halfway through[/blackout]. In fact, I'm starting to think that Cavill should [blackout]appear as a villain more often in movies[/blackout], because he was more interesting playing that instead.
Saw the movie in 70mm IMAX this time, which was way better. Definitely worth seeing it in that format, although only two scenes took advantage of the entire 70mm frame, which were the HALO drop and the ending helicopter chase. Neither the Paris or London action scenes were shot in 70mm IMAX, which was disappointing.
Had a great crowd both times, although at my IMAX viewing, I had the unfortunate displeasure of sitting one over from a guy who laughed super loudly at the movie at least once every 5-10 minutes, more than loud enough for everyone in the theater to hear, and most of the time he was the only person in the theater who was laughing. One of the most weird/confusing/awkward theater experiences that I've ever had.