On the upside I rented a PX4 and I now love that gun...also the ringing is gone I don't know If there is actually permanent damage but OTOH, YOLO.
Every time you get ringing in your ears from being exposed to loud noises, you've gotten permanent damage, it's just a question of how much that's gone. You wouldn't really notice it either.
I want to shoot a FN Five-seven, but there's noone around here that has one. Gun ownership isn't unusual, but pistols are rare.
Never shot one but it seems like it would be comfortable since most of the bulk is closer to the hand. I have a bunch of ranges around my area, if I ever get the chance to shoot one I will tell you.