Canon 5D Mark III vs T2i550D Comparison

Before I start shooting with the Canon 5D mark III a lot I wanted to see how it relates to my 2 year old Canon T2i/550D. Several people have been asking me questions if this is something worth the upgrade. Is it really worth $3,000 more? This comparison only has to do with video, I’m really not talking about stills all that much here.