Interesting. Was the biggest difference in initial stopping power or in fade resistance? It's easy to see the size difference and I would imagine that the initial application is much tighter. I still find myself leaning on the SRT's brakes a little harder than necessary even in the boring daily commute. An easy touch goes a long way.
My old commuter/twisties toy was my Shelby Charger. It's got minivan front brakes, Daytona rear discs, and weighs 700 lbs less than the Crossfire. It's a great car to play with but the balance is off. A typical nose heavy FWD car. Every now and then I hop in my Cummins and fall back into truck mode. After logging over a quarter million miles, it's easy to fall back into the saddle. I've got to remember break the muscle memory when I get out of it and into the XF.

The hot rod can cook the current brake setup without much effort. I think I'm going to have to learn the brakes all over again once I ditch the 11.75" Diplomat cop brakes and slide the 14.2" AMG setup in there. The rears will be stepped up from 11.5" to 13" rotors.
It's a bunch of brake to stop a car weighing 400 lbs more than my SRT. One of these front rotors has as much friction area as three of the factory drum brakes. The heating issue should go away and it will probably take nothing short of abuse to melt 'em.