All the zuiko's I've ever used have been fantastic. I've been on the lookout for a good 100 and some of the longer stuff as well. But have you considered the 135mm zuiko? I bought a 135 3.5 silver nose on a whim as it was cheap and clean but knock me sideways if it doesn't render the backgrounds out of focus in the most delightful way. It's creamy smooth with no distractions.