I haven't seen A Christmas Carol yet, however I did see  Pixar's Up at the recently refurbished BFI IMAX. Visually intense, the story at the heart of the 3D illusion is of course where Pixar really delivers. There's always a sense that it takes years, (which it does) to develop a movie like this, with nothing rushed or left to chance. I'm working my way through a book on Pixar, and I look forward to reading more about the story editing process as a script goes into development, how much visual design is done in tandem with writing, if at all, etc. Up was preceded by a stunning 3D trailer for Alice in Wonderland and the enchanting Pixar short film, Partly Cloudy - here's the best quality full version (for as long as it lasts up on RuTube!). Enjoy.