Upload & Sell: On
The 150A is an incredible portrait lens - not only deadly sharp and great CA control thanks to the ULD glass, but like most M645 glass, has awesome tonality and in thei case kicks-out great skin tones.
Bought and sold a lot of glass as I shifted over to Nikon, but my M645 120/4 and 150/2.8 A are 'never to be sold' keepers. Also, another vote for the Fotofiox Pro adapters.
No info on the 150/4, but the 150/3.5 while nice in own right and a lot of lens for very small $$, is not in the same league as the 2.8A.