Interesting that two of my heroes have restored CX500s. A C model was my first street bike and "sport tourer". I thought it was a pig and traded it in on the 82 Sabre after my first road trip to Rocky Mountain National Park Check out the sissy bar backrest and high tech luggage system.
My CX has turned into a favorite bike for local evening rides. Rode a friend's stock CX500D (Mikuni test bed beater bike) in NC with a new set of Mikuni's installed, he sells Mikuni kits around the world. He told me to run it hard, so it pulled the front wheel completely off the ground when I shifted to second. Of course the original front suspension was soft, so have to admit it had a pogo stick effect.
My 1980 CX500D came in at 400lbs wet and with larger jets, K&N pod filters, Ignatech ignition, and free flowing exhaust, it still does not run as strong or as economically as my 2015 CB500X, but there's something about it I like when riding on evening sunset rides.