Substantially better? It's the last lens to be issued, and should have the best coatings. If you don't use lens hoods and like including light sources in the your pictures it could be a better buy. Theoretically it is less worn, but it is still 10 - 15 years old. I wouldn't go out of my way to replace a Seiko 80 2.8 with an 80s, but I might pay a small (15% ?) premium over a good condition 80 if I wanted an 80mm.