Finally a "model release"! Thanks to purpleazona for permission to upload. www.flickr.com/photos/purpleazona/
I think this pic demonstrates the leica 90mm f/2's abilities as a portrait lens. Plane of focus is sharp but not harsh, transition to out of focus areas is smooth, the background is a nice soft wash of colour without distracting artifacts and the out of focus highlights are nice and even without hard edges (see orange blobs top left).
Taken with a Nikon D700 and Leica Summicron R 90mm f/2 (with leitax.com mount conversion)
@ 1/500s, f/2, ISO 200