Also with the speed booster, here are a couple from an opera scenes performance with the Zeiss Contax 80-200. I find it difficult to hand hold it steady on the Nex 7 with my old hands.
Here's a recent one taken with an NEX-6 and OM 135mm 2.8. The OM 135 2.8 is nice and sharp wide open, just like many other OM lenses. They're also small, and very well built.