I'll toss in another all metal hi-cap .45, the Sarsilmaz K2-45. CZ based with 14+1 capacity and feels like a much smaller, albeit, heavier gun.
I've owned a USP 40, and although not same caliber, the USP wasn't a better a gun, save weight. Carried both on duty, traded the USP for an M&P (and some swag), haven't looked back.
The Sar's trigger is better then the USP's, actually holds one more round of .45 vs the USP 40, and is eons more ergonomic. I found the grip on the USP to be a tad short for my glove size large hands, but the Sar fit my hand like a glove.
Just something to stir the pot, as IMHO, the Sar, is every bit as good as H&K, and had it been lighter, would still be in my duty rig.