My Nikon kit is a 50/2 (non-Nikkor), 28/2.8 AI and 20/4 AI. Both the 28/2.8 and the 20/4 are wonderful lenses and the 20 is very wide indeed. While I wouldn't mind owning the 18 over the 20, I don't think I need to go that wide 99% of the time and it's great that I can share my 52mm diameter filters between my three lenses as they all have the same-sized thread. I'm pretty sure that you'll have trouble finding a bad wideangle Nikkor, so no worries on the quality.