Quote 1
[Luzhin:] "On the contrary, you'll have to answer, gentlemen, for violently obstructing the course of justice." (5.3.70)
Even though Sonia is judged innocent of Luzhin's accusations due to Andrey Semyonovitch's sharp eyes and fearless tongue, there isn't justice for Sonia, and Luzhin doesn't have to suffer for his crime. Nonetheless, it is probably the closest thing to a feel-good moment we get in the novel. It might not give us full-blown justice but perhaps, at least, a hope of justice.
Quote 2
[Luzhin:] "Am I to get married simply for the sake of the furniture?" (5.1.2)
This is a pretty funny line. We can almost empathize with Luzhin at this moment. He's gone to some trouble to set up a nice home for Dounia. Too bad he wants her there as his slave.
Quote 3
[Luzhin:] "[…] immediately after your visit I found that a hundred-rouble note was missing from my table, in the room of my friend Mr. Lebeziatnikov." (5.3.5)
If Luzhin has his way, Sonia is about to start really suffering. Fortunately, there are some decent people in this novel, not the least of whom is Andrey Semyonovitch Lebeziatnikov. Luzhin's plan backfires, and the suffering boomerangs back on him.