Now I am guessing that the fastest lens that you have is f/1.4 or higher, which is very fast. But there are some lenses out there which are faster than f/1.4, faster than f/1.2 or even f/1. This article is a showcase of images taken at f/0.95, at that wide of an f/stop you can create incredibly shallow depth-of-field and utilize some really faster shutter speeds. Not to mention incredible low light capabilities.
If you have any images taken at these super fast aperture, please post links to them in the comments below. Copyright for all of these images is held by the photography. Do not reproduce or republish any of these images without permission.