Yeah the 80mm Planar is most users first lens. The black ones with a T* marking are multicoated. I have one of these, great performer.
But I`d like a newer CF lens as they have a smoother focusring and are bit easier to handle. I have the 150mm Sonnar too(f/4 btw,) also a great lens. I got it cheap because of some scratches in the front element(that doesn`t degrade it`s performance at all). For portraits the 150mm is great, but I will get a tube for moving in for tight headshots.