MySQL v. PostgreSQL

I've been a long time user of MySQL. I neither love it, nor hate it; but I do find that it meets all my database needs. I was reading the Reddit job posting the other day and I see that they use Postgres as their database and I thought to myself, "is there something I'm missing?" I've never really looked into Postgres, but it seems like I see it popping up all over the place. What's the consensus? Is Postgres superior to MySQL in some way I'm unaware?