I agree that it wouldn't be at all surprising if the Overbury's was designed for a touring-type gentleman trying his hand at 'off-road', whereas the Kona is designed to race. On the other hand, the short wheelbase of the Pioneer will liven up the handling and go some way towards compensating for the slacker head angle. The quoted wheelbase of the Kona is 42.2 and it wouldn't surprise me if straightening up the P2 doesn't get you pretty close to that.
I wasn't suggesting that the Kona is ultra light. The designer (I think still Joe Murray at that point) chose the Ultimate Ultrastrong for stiffness/strength. Other makes e.g., Orange, ParkPre, Marin, offered frames made entirely of Ultimate Superlight, but sometimes spending an extra 50 grammes on a stiffer down tube can make for a faster bike.