I was starting to look at those dedicated image sharpening filters when I though of checking Filter Forge. As I previously posted, Filter Forge is really a platform for developers and even users to create and modify Photoshop filters. Currently, there are over 6000 filters available for Filter Forge. There are 4 different editions (starters with limited filters and then basic, standard and professional editions with unlimited filters).
Back to my search for a sharpening filter, I found the Advanced Sharpening filter which converts the image to Lab and then uses an edge detection algorithum. Sliders provide dedicated options for Lights & for Darks.
Now with over 6000 filters, there is plenty to choose from. The following are just a sample applied to the same photo as above.
Filter Forge has a 30% off sale on all editions, but the sale ends this week. Be advised, there is a limitation on the number of installs. However, there are additional discounts for volume purchases starting with just 2!