Yeah I do, as a prime lens with a big aperture, that makes it very fast to focus and fantastic in low light.

It is also fixed at 135mm focal length so the compression (think close background) is unmatched

Uses are portraits, wildlife and sports action type shots.

Small downside is I have to a long way from my subject to get them all in my frame (tell that to a colorful wren perched in a tree)

PS. good question you got me talking.