Consider this more an opinion than anything else; but I think ALL the Wilson custom pistols are more of a prestige thing to own than what you get out of the rest of the assembly line guns.
Just like the names Wilson gives his guns, everything about their description is carefully worded to elicit a reaction from a potential consumer (salivation). He calls the KZ-45 "the world's finest and most efficient fighting handgun" and it's only 1K. So why not make just these, and throw in a compact based on the same design, since in his own words, the KZ's the best?
Yes, I think the craftmanship's better in the top shelf guns since one guy is doing all the work and QC; but the difference in quality will never be enough to justify the difference in price. It's like buying a Mercedes when you could have bought a Lexus in the same class for less money. You pay to be counted anong the elite, which doesn't mean what you're buying is actually an elite combat handgun.
That being said, I'd buy the CQB and save the remaining cash for about 5000 rounds of ammo and some extra mags.