I own several G19s, and recently got a SIG P320C.
I love my G19s.......
BUT, as soon as I buy one I take it home and rip the guts out and put in usually $100+ worth of parts (trigger spring kit and connector, extended slide stop, extended mag release, night sights, etc.).
I do this to get the gun how I like it to feel and shoot.
Having to spend that on a brand new gun to achieve "Perfection" is ironic at best.
I test fired a rental Sig P320C and was instantly in love. Bought a Sig P320C FDE the next day.
To me, it is every bit as good, and in some ways better right out of the box than G19 "Perfection"
The trigger pull and reset, and sights are awesome, great ergonomics, and it is silly accurate with factory, reloads, and defensive ammo.
The 320 and G19 are for practical purposes essentially the same size, and equal to me in conceal/carry-ability.
After all the upgrades to the G19, the P320 is essentially the same price as the 19.
For me, I'm a convert and my 320 is now my carry gun and home gun, and I'll be getting at least two more 320s in different configurations (a 320RX is next on the list)