I currently own and use the 55mm f/1.2 lens. A good lens it is but I have found a few that are quite worth having and using as well. The Canon FL 50mm f/1.4 is one of my favorites as well as the FD 50mm f/1.4 SSC lens. Investing your money in a superior (?) lens might not be a good investment when their is other Canon glass to be had for less. My next investment would be the 85mm FD lens but it is out of my budget limitation for now.