It's not the power - the F12 Berlinetta has more power and a dual-clutch box - it's the weight. A dual-clutch box that can handle the power would have been over 100lbs heavier. That's also why the Huayra has a single-clutch box. The LFA, strangely, started out with a dual-clutch box and then went to a single-clutch because the engineers wanted a more abrupt gearshift feel. Or so Clarkson says anyway.Incidentally, Clarkson on the LFA.
Here's a group of photographs loosely related to cars on the Boston Globe's website. There are some pretty cool images- 1, 2, 16, 17, 18http://www.boston.com/bigpicture/2012/12/the_automobile.html