Okay, here’s the test.
Canon 7D, 250mm, ISO 1000, 1/1600, f/6.3
Both versions are edited (one with the blur and sharpening, and the other with just the sharpening) and severly cropped from the same picture. I named them so you will be able to tell which is which.
I think that the best thing to do is to add sharpening to the whole picture, and then use a mask and select everything except the subject and apply the blur. Right, buddingphotographer?