Referencing this post, don’t want to add potential spoilers, it seems OP is watching for the first time.
Come to think of it, next episode Sofia did what Oswald pretended to do in this confrontation. She killed her father, her most prominent weak point. And yes, such a difference between Oswald and her in this. Martin storyline was touching, even if it was not subtle, Oswald loved the boy and was loved in return. But Sofia and her father - I don’t think there was much but hurt and resentment in that relationship. Maybe Falcone was the only instance were Sofia has shown real emotions, she pretended in pretty much everything else - unlike Oswald, who can be both a deeply emotional man and a very cruel cunning one, too. Sofia is further on the ruthlessness scale than him, but at the same time she’s almost more shallow. Who (or what) could be her weakness after she herself killed her father? Could it be possible - to exploit his death as a way to make her feel guilty or just disbalanced enough to destroy her? Or could it be the way to turn Zsasz against her?