I am considering buying a 50mm lens for Nikon. I didn't use my 50mm from my Pentax SLR a lot, but I just developed some photos shot with a Leica 50mm f2 summicron and they are beautiful. EX: I now have a 28mm on the nikon and I love it for general photography, which includes people a lot. What do you guys think? Should I buy a 50mm AF Nikkot [$150]?