I don't have much experience with that lens but using it for night street shooting I've found that it will produce every artifact imaginable -- and some that aren't -- like distant traffic lights creating "donut holes" like a mirror lens. These were mostly wide open, using HP5+ kicked up to 1600. It is nice and sharp, but the contrast seems rather low. That's not really a bad thing as it can boost shadows.
I also have an MC Rokkor-X PG, that I think dates from about 1975. The flair control with that one is stunning.