Maybe leathality would be a better term. The rest of your post is kinda my real question. Is the 9mm round (using the right high qualify ammunition) sufficient to "get the job done".
I would say yes. Although I'm a .45 man, I carry 9mm frequently as well. Many police agencies (including my local PD) use Glock 17's stoked with Speer Gold Dot JHP +P 9mm and I don't hear any complaints.
There are some manufacturers who make 9mm +p+ JHP that sends a 115gr bullet going over 1400fps. That's no joke