All-Star Superman is the best representation of that character, and one of the best comics ever. The premise is that Supes has a year to live, and has to figure out the best way to spend that time. Some of the sci fi stuff is pretty off the wall, but the important elements of each issue's story are clearly set up, dealt with, and paid off. One story even addresses the question of why Superman doesn't just smash human society and replace it with the Kryptonian FALC.