The only “modern” duty/self-defense pistol in production with an almost identical grip angle as Glock is the current Steyr L/M/C/S series (Steyr 111°, Glock 112°). But then again that’s because the same designer had a hand in both of their development, Wilhelm Bubits.
My old C9-A1 and Glock 19 from years ago at time of purchase, then one of my other Glock 19’s and P-10C, followed by a random pic from the web showing angles:
One thing to keep in mind is that grip angle has less to do with the angle of the magazine well or the frontstrap angle, as much as it does the backstrap. The frontstrap doesn't have much to do with how much your wrist bends since your fingers can grip independently. As an experiment, if you stick something between one of your fingers and the frontstrap, the grip angle won't change much because the three individual fingers can conform to the shape. Stick that same thing between your palm and the base of the backstrap, and you'll notice a much bigger difference. Since your palm is a single unit, if you keep the wrist angle the same, the front fingers can adjust to the new angle while the palm cannot, so the gun points differently.
Another tell-tale is the angle from where the trigger guard meets the frame, and the high point of the grip tang. This bears out when you look at how Glocks point high for many people. The hump at the bottom of the backstrap, high tang, and relatively low trigger guard all bring the rear of the gun lower in the hand than the front. It's why you see so many Glocks with highcut trigger guards and hump/grip reductions to get them to point lower.
