This is objcetif is excellent (soft for portraits f1.4 2) then great from 2.8. But he has one big problem fragility, a design that default do that at the least little shock ring AF stopped spinning and solution 2 (a minutieu and difficult disassembly, or passage in gun 80 ..) .
So I highly recommend if you want to take a 50mm 1.8 (only 2/3 difference diaph) 200 less and better quality.