I've got a Glock 19. When my 365 shows up I'll take them both to the range and shoot them side by side.
If, after a couple of hundred rounds, I can shoot the 365 as fast and as accurate as I can the G19, I will think that's pretty good.
If on a timer and measuring groups I feel pretty sure I'd be "better" with my G19. I think I would have to have a timer and measure placement to tell that though. IMHO, the P365 doesn't outdo the G19....but it does very, very well in a smaller package.
