C14 compared to other sport touring bikes: As good or better than most.
C14 compared to a Goldwing: If you're looking at rear seat comfort, not even in the same ballpark.
You won't find any sport-touring bike that rides as comfortable as a full-on touring bike. You have to find out just how comfortable your wife needs to be, and how often she will be riding with you.
I have a C14 because I usually ride by myself and want a comfortable sport bike, and one that my wife finds comfortable for occasional day rides. If my wife rode with me most of the time, and on longer rides, I'd definitely have a Goldwing.
Take your wife to a Honda/Kawasaki store and have her sit on both to see what she thinks. If the C14 is still a possibility, see if the dealer will let you test drive one with your wife on back.