Clearly, in my mind, the K1 as shown above in a beautiful example is the pick of the litter. Chrome tank with side rubber without that ball buster tank of the K0. The Later CB's are all lovely as well but I particularly like the ones with the drum brake on the front. They just look so perfect for the period. I've owned a 70 CB450, a 71 CL450 and a 76 CB500T. I just bought a 72 CL450 that is going down the cafe/tracker/?? road. It is was too early to decide what will happen but the side pipes, which I never liked, are already gone.
Ronny's K0 is a real winner in my book.