I think he is using H4D or H5D or even H3D maybe, so whatever he uses they all are almost equal, just one with 33x44 and another with 36x48, so it will not be a big different which lens he uses much.
For portraits, i recommend HC 100mm f2.2, if not then HC 150mm is very nice one, i heard nice reviews about 100 and 150 for portraits.
HC 120mm is great and very sharp, but it is very heavy and very slow focus, i had bad time using 120 macro for portraits, but once i look at the results i forgot all that bad time.