There are some very excellent Sony/Minolta lenses. You can check if Sony actually redesigned a lens or simply rebadged existing Minolta design. In the latter case getting the minolta variant is probably cheaper...
This is with the A7 and a Sony 135mm Smooth Transitional Focus. IMO if you want a long portrait lens for outdoor or studio work, and don't mind manual operations, this lens is it's own league. The bokeh speaks for itself, and MTF curves are sky-high - I won't doubt that it can handily outresolve the A7r wide open.
Victor is too lazy for DSLRs
Sony A7rII Kolari mod
Noctilux ASPH, 35lux FLE, 50 APO ASPH, 75 APO cron, 21lux, Sony/Minolta 135mm STF