Big Hero 6 is Disney's 54th animated feature and the first one based on a comic book by Marvel after Disney's acquisition of the franchise in 2009. But just like the studio has done so many times with other stories, the film is really very loosely based on the characters and plot of the original comic book.
The movie was directed by Don Hall and the super amazing Chris Williams who's been a great part of Disney's new renaissance with movies like Bolt, Frozen and now BH6.
Going back to what Disney does best, the movie focuses on amazing characters (design and personality-wise) and a great story.
In my own opinion, this is Disney's best movie since Emperor's New Groove which came out in 2000, so this is a pretty big deal.