Where part of the city are you going to be in? Can't say as I've seen a lot of commuters in OKC, but then I spent most of my time in the Midwest City/Tinker AFB area. Most riders I've seen are up around Lake Hefner (nice loop around that lake) or between OKC and Norman along Sooner RD/Draper Lake/Lake Thunderbird. Sorry I can't provide much more than that.
Norman, where I live, is a great place to ride. Perhaps being a college town has some influence on that.