Yeah, but keep in mind that most of the population doesn't have relatively big hands. I like the USP myself; but given a choice between a hard checkered grip or a more ergonomic rubberized-type backstrap that's interchangeable to match my hand (like on the P2000) plus the o-ring barrel like the tactical models and Mk 23, I'll take a bit of comfort. Yeah, the objective is to put a hole in the bad guy, but it doesn't mean I have to sacrifice comfort in the process. Comfort = less shooter fatigue = longer rate of accurate fire.
A4s is dead on (no pun) - H&K is simultaneously courting two large markets in both the military and the civilian side, and in the process they stand to rake in a buttload of cash. As more reviews show up and the pistols make it out to ranges for trial/rental we'll be able to make an informed judgement. I'm willing to wait a bit instead of plunking down for a P2000 or USP Tac right now. If it's not all it's cracked up to be, then I still have options.
The advantage of a smaller magazine makes for either a slimmer grip, a smaller weapon, or both. Shouldn't be much larger than a 1911 (I've seen the specs but am just too lazy to go looking right now). This allows for more carry options (including concealed carry). Compact models will be avail as well. Try that with a Mk 23 - know what I mean?