"Gee, how do folks win high level matches with Glocks?"
The guys in competition utilize the long-slide versions which come with a 3.5 lb trigger pull. Usually they will swap in an aftermarket barrel and have a few other tricks.
The police use regular Glocks with no aftermarket tricks and heavier trigger pulls. Some departments use trigger pulls up to 12 pounds.
The guys with the 1911s are using single action with a light trigger pull. Police departments have successfully fielded the 1911 only after extensive custom work. The Marines specops were using a heavily modified Kimber. The FBI swat teams use a heavily customized 1911. I havent seen any departments simply pull a regular version 1911 out of a box and make it their pistol.
The Sig and the HK are the only pistols I know of that are very accurate right out of the box, reliable and can be fielded without any custom work.
The HK seems like the ultimate weapon as it combines Glock toughness with Sig accuracy. The HK doesnt require cleaning to fire accurately (HK says 5000 rounds before the first cleaning). Unfortunately, the USP is not within most department's budgets. Funny, how the Air Marshalls get Sigs where as the pilots get USPs. The difference is that the pilots are paying for theirs. So essentially they are saying price dependent Sig, price independent HK.