Yes.
Sorry, just couldn't resist...
but yes, lots of people have known those people, I've known several. None of the ones I knew are still alive to give first hand accounts, so all there really is available today is hearsay, and those written accounts you can find in memoirs and some history books.
Generally the guys I knew who did use the .45 said some variation of "I shot him, he went down" and little else, simply because that was all there was to say. Often, if asked for more details, they'd say "I was a little busy at the time and didn't notice much else" (and some were a bit less polite,
)
Read enough accounts of WWII and you'll find some amazing things. Like several times where the mighty 1911A1 jammed. The "never jam" reputation of GI .45s is an embellishment over decades, the truth is not that they "never" jammed, but that they jammed less than the other guys pistols, USUALLY.
There is even a report of a parachuting pilot shooting down a Japanese fighter with his 1911A1.
The guys I knew generally had the same attitude about it, something along the lines of "I'm here, because it worked" and they felt it would do so again, if needed.
I've never had to shoot anyone with a pistol, but I've shot a lot of 1911 pattern guns, worked on them, inspected and repaired them for the Army in the 70s, and there isn't the slightest bit of doubt in my mind that if I do my part, they do theirs.