My Favorite Lens, is older than me.
This little gem is a few years older than me. But I guess lenses are like whiskey the older they are the better they get. I can't believe that I payed less than a 100$ for it because it has a dent in the barrel that doesn't affect its performance. The sharpness is great, great color rendition and is f2.8. The only downside is that is manual focus, which is not a problem for me you just need to practice a little and look for the small focus mark on the lower left side of the viewfinder.
The colors you get out of it are interesting very classic or vintage, and if you want a toy lens feeling you can open the lens to f2.8 and get some interesting vignetting and soft focus on the corners. Its also very compact and lightweight, conspicuous and I love the way it looks on my D600. The best lens you can get is not always the most expensive. To me the most important aspects of photography are light, composition and the equipment. In that particular order.
Don't be afraid to experiment with older lenses, these where the professional grade lenses one generation ago. Many people loved to work with these lenses specially landscape photographer Gallen Rowell who was famous for using exclusively this 24mm lens.
Carlos "Hakuin" Ocando