I'm very impressed with my 4.25" Python, EXCEPT the rear sight. Mine is so loose and sloppy that, fundamentally, it's unshootable. Best "group" I've been able to shoot, seated, with a rest, is about 4". For reference, that's about half again bigger than I can shoot in the same condition with a P365XL.
I don't doubt the revolver is capable of much better, but I can't get any of that with the POS rear sight. Shelving mine to avoid wasting ammo until my Wilson rear sight comes in - hopefully it'll be before I get so torqued about this that I just sell the revolver...