Replying to 5D or FS100

So I am allocating a budget for a new camera update from my Rebel T3i. I have lens set aside - Tokina 11-16. Canon 50mm canon 35mm. and the Canon 24-105 L glass. I am now looking to move to better resolution and a full frame. I did take pictures with my T3i but I think this time around I am doing a bit more of the film side. I may keep the t3i if I go the fs100 route but was curious on how the 5D stacks up against in and what lens would be needed for the FS100 side!