This tutorial video compared the dynamic range of sample video shot on a Blackmagic Cinema Camera and a Canon EOS 550D. Settings were matched between the two cameras, and it's easy to see where the BMCC allows you to recover highlights the Canon couldn't capture.
Not a scientific test, just an example of a typical situation you could encounter, and an introduction to dynamic range if you're not familiar with the concept.
Apologies for occasional audible bumping of the microphone. :)