If you haven't, try Ursula Le Guin. Her psychologies aren't rendered in quite as much detail as Dostoyevsky's—perhaps because she comes after and therefore need

If you haven't, try Ursula Le Guin. Her psychologies aren't rendered in quite as much detail as Dostoyevsky's—perhaps because she comes after and therefore needs to break less ground there?—but she's unique (in my experience of) sci-fi/fantasy for her deep grasp of and willingness to explore psychology, individually and collectively.