Bob had asked how difficult it was to focus 135mm f/2 given the very shallow DOF zone. As one can see by the red text in Column G, if one does focus-recompose of angular change of only about 7 degrees, that is the limit that DOF at f/2 would let you get away with recompose!
Isn't it similar to what 200mm at f2.8 would be? I used both on alternate nights from the same seat recently. The bokeh differed slightly but the blur was strikingly similar.