Love the Canon EF 35mm f/1.4L USM
This is not the greatest of images, but it illustrates what I love about this lens.
A dim small room with no flash, and with the "Canon EF 35mm f/1.4L USM" you can blur the background enough to have your subject pop out of the image. Great colour contrast and sharpness.
Wide enough to include some context for your subject without distorting them.
I've heard professional photographers say if they had to live with one lens, this would be it.
I've only had it for a short while, and already it is my favourite lens.