not quite
I've taken a G20 hunting, more than once, but I have not taken a whitetail with it. In my instances, I used it just like a bow, climbing tree stand, and handgun range equals bow range, for me.
My eyes are to the point that I do not shoot the G20 or any iron sights as well as I used to. The new red dot ready long Glock 10mm is calling, but that would be a lot of cash for a new pistol and a quality dot. But I will almost have to if I want to keep shooting well without special glasses, at least for a while.
While deer scouting this fall, I killed the world's most unlucky coyote. I topped a rise, and he was quartered away, looking the other way, at what turned out to be about 60 paces. Produced the G20, held toward the forward middle, and shot off my walking stick. The 180 truncated FMJ hit him just behind the ear. That will likely be the longest handgun iron sight shot I ever make, ever again.