Camus was a terrific writer, as was Malraux. I'm not familiar with Levinas' works. Which of his books would you suggest for a first-time reader?
One of his important contributions is that he incorporated religious concerns into his analysis (he was influenced by and influenced Martin Buber and he commented secularly on the Talmud) and that he focused on knowability in the sense of kennen - i.e. I come to "know" the Other in the sense that I come to know a friend or an enemy, not in the sense that I "know" a fact or a datum.
You can see a strong Heideggerian influence in his use of language and his distrust of traditional metaphysics.