I find that 24mm is pretty hard to control handheld if you care about relatively sane backgrounds of buildings and such on your street shots. The lines get pretty seriously weird if you are not pretty level. For me 28mm is as wide as I want to go handheld. I have the 28mm AI-S and it is fabulous... but it is manual focus, if that matters to you. I previously had the 35mm f/2D and found it great in the middle but slightly soft in the corners on full frame. If you are mainly shooting things that show up in the 70 percent middle area of the frame, it is a totally fabulous lens. Has a very good look to it in b&w especially, unlike the very bland 50mm f/1.8D (which I still have), which looks very ordinary, but sharp.