As far as bokeh goes, the Summicron 90mm f2 [Canadian version, E55] is one of my favourite. I had an older version before, but the minimum focus distance was not as close as this one at 0.7m, which is excellent. Most lenses in this focal length is at about 1m. Like all Leica lenses, it's built to last. Every time I hold it in my hands, it reminds me how a beautiful lens should be made. Every time I look at the images captured by this wonderful lens, I thank Dr. Mandler, who gave the world so many world class lenses, including this one.
Images taken with Sony A7 and Leica-R 90mm f2 Summicron.