Canon Is Lens
What is your favorite Canon lenses you can not live without him?

I have a Canon 50D, who just want to get a new objective. What are your favorites? I am a portrait photographer, so what is your favorite for that kind of photographs! Thanks!

Canon EF 50 mm f / 1.4 – Common Canon EF 17-40mm f/1.1 – Canon EF 70-200mm expensive f/2.8