Katelyn James did an excellent portrait comparison between an 85 f/1.2, 100 f/2.8, 135 f/2, and a 70-200 f/2.8. Her conclusion was that the 85 f/1.2 was her favorite, factoring in both the bokeh and subject distance, although the 135 f/2 was close, and I'm sure the 135 f/1.8 is much sharper now...