Dude, about a month ago we had to borrow a loaner from the local Ford dealer.
Ext cab F450 with a V10.
It rode WAY smoother up front and I loved it off road. Floated around and took off easy when you gave it a little gas.
But it sucked major ass pulling the little hills around here loaded going down the highway. It wasn't totally gutless but I could instantly tell a big difference.
The 6.7 is a beast though, turbo diesels kick ass.