i don't have Tron Legacy, but the most intense - in time - loudness i heard in a movie is Terminator Salvation.
sounds over 105 dB are heard very very often during the movie, so much so that it is the only movie I've ever heard that desensitized my hearing - for about one hour - post viewing the movie.

i highly doubt i will ever watch that movie again, as i don't like to watch a movie or listen to music at levels below "realistic";
they lose too much of the "artistic intent".

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery