What about the 85mm? How do you think that would work?
That's a great lens (I'm talking about the affordable f/1.8 Canon) if you have enough working distance and you like the perspective you get from shooting at those distances.
I wouldn't dare go out on a paid shoot with only that lens in my bag. It might be the only lens I end up using though. If you shoot primes, it's good to have a wide range of focal lengths to chose from. The Sigma 30mm f/1.4 and Canon 85mm f/1.8 is a nice combo that covers a lot of ground.

