I have been waiting for Spring to work with this lens. I liked the images I saw last fall using it on the NEX-5n. The out of focus portions generated by this lens really capture my interest.
These are at f2 or onehalf stop wider. The Av mode on the NEX-5n seems to accept wide open readily and exposes quite nicely.
These were taken with a Pentax K20D in Av but I found I was modifying exposure by as much as two full stops. Even then the images were pretty dark. I shot jpeg only. I suppose it is time to use RAW.
Alternately, I found live view exposed nicely. Controlling focus with narrow dof hand held was a problem when the image disappears for the double shutter action. Tripod pending.