I've included the above image as an example of what's possible when using these longer manual focus lenses. It is sharp with some nice colours with the background out of focus. It is also nice bokeh, smooth even though the background was rather busy. This lens gives nicer out of focus background than my Pentax 135 f3.5, but I prefer using the Pentax.

Compare this image with the one posted a couple of days ago, taken with the Leica Elmarit 90 f2.8. Same place, same leaves, taken a couple of of days apart.