Thanks cputeq! I like that lens a lot, it is actually the only one 20 mm lens I have that has no problems on the A7r. My VC Ultron 21/1.8 is a bit sharper but has colour cast on the wide sides, which is extra work in PP.
Also the advantage of all those FD lenses is that you can do with cheap adapters because all the shiny parts are on top of the adapter, so no inner reflection problems on the sensor.
BTW I just bought an all black Kipon adapter for C/Y mount, it is very good and half the price of a Novoflex.