An experiment in fundamental digital sharpening:
I took a picture of a 'printed from structured graphic' floor plan using my Sony 70-300G at 300mm from 15' away on my Sony a850. (See previous image)
I then scanned a portion of the extremely high resolution print. From the photograph of the print I inserted small sections of the image rastered from RAW.
To do that, I prepared the photograph twice from RAW by sharpening in ACR (left insert) and another version sharpened only using USM 200 0.4 02 (right insert) and up-sampled using nearest neighbor.
This is interesting because of how the differences in sharpening affect line width. In this experiment we can compare it to a known source.

(edit 2018) Newer versions of ACR, newer & higher-res cameras with no anti-aliasing filters like my a7RII and my newer higher micro-contrast FE 70-300G might (probably would) make a difference.
At the least, this marginally softer SAL 70-300G zoom combined with a lack of an anti-aliasing filter will emphatically change my initial 'ol time USM parameters to a significantly smaller amount and with a slightly smaller radius.