Sean, there is magic, I think. I've been led to believe that there is a noticeable improvement in the latest 3 bodies, compared to the previous full frame sensors (I don't have the bodies on hand, feel free to send me a few!) For instance, I don't like to push my 1Ds2 beyond ISO1600, yet I see images from these new bodies at ISO25600 that are very usable. Some black-magic enabled a big jump in high-ISO usability, and that jump hasn't been done on crop sensors.