I took two systems with me on this occasion, the Olympus OM-D mounting the CV 50 f1.5 and the Sony Nex-7 mounting the rather large Konica 135 f2.5. I have a number of the smaller 135 f3.5 lenses and all of them are acceptable and produce some nice images but I wanted to try something faster. I was actually looking for a f2.8 lens but I couldn't find one at a reasonable price so I bought the f2.5 one instead. The prices for these old manual lenses certainly are rising on the market, especially the f2.8 and faster lenses. Try finding a Canon f2 of f2.8 manual focus lens at a relatively reasonable price today. Just impossible in my part of the world.
Anyway, I digress. As you can see, the lens produces some nice images, provided you nail the focus. Although the Nex system has focus peeking, and is the best on the market at the time of this blog post, it is still extremely difficult to nail the focus at these focal lengths. The DOF is really tiny when you are working wide open. But when you get it right, the quality is great.