Interesting even when you put it on another body, like the D610. The sharpness is nearly the camera resolution. Wonder if it will fare similarly on Canon bodies? It doesn't appear to just be sharpness. The other attributes (distortion, vignetting, and chromatic aberration) also appear to be an improvement over Canon's 50mm offering.
Probably go for a great white first, but once you are in that territory this doesn't seem so unreasonable.