The quality is utterly superb: no moving glass means totally sharp subjects surrounded with a beautifully hazy background (bokeh), so it will be great for portraits. I haven't tried it with moving subjects and decent light yet, but I had a go with some flowers last night.
Some samples, and a few more here. Click on these ones to enlarge.
Crocheted by Christine
Neon artwork on the university's art building. Not by one of our professional art teachers…
I've also ordered a reversing ring: it lets you turn your lens round for ultimate close-ups. Should be cool.