Browning's 1911 was not his first semi-auto, or even the first semi-auto handgun. However, it being a .45 and it's instant adoption by the U.S. Army, and it's decades-long role in that capacity cannot be denied.
The Glock's place as the pistol that pretty much got U.S. law enforcement away from the .38 revolver cannot be forgotten. It is also responsible for the explosion in developement myriad pistols now available in the civilian/cc arena. It's action is simpler than Browning's in it's operation and maintenance. Let's not forget that Browning developed the fist hi-cap 9mm.
Sooo.....Revolutionary impact? It's close, but I have to give it to the Colt .45.