Nope, can't complain at all about road or wind noise - I've seen people stating they hear some wind noise when at highway speeds, but I haven't heard anything like that yet. On smooth roads it is crazy quiet for me. Of course once I get onto rougher roads then I'll hear the rumble of the tires on the road but isn't that loud.
Haven't experience any abnormal amounts of road noises either. It's been fairly quiet for the most part. It's no luxury car but they did put in more measures to dampen road noise for the K5 over the outgoing Optima. If you feel that it's still too loud, perhaps look into sound dampening the floor and doors with acoustic foam.