Well, I guess it depends on what is meant by a "comfort" bike. I have seen some that look just fine. They have a relaxed geometry for more stable handling, a more upright posture, wider tires for a softer ride and so on. The one I saw was a little heavy 25 lbs so it is not a high performance rig. But it is a perfectly good choice for a person who wants to maximize comfort at the expense of performance.