Thanks for your comments, everyone. I re-uploaded the file, with no sharpening applied, and when I downsized I used the plain Bicubic algorithm. It doesn't look much different, LOL. I guess the FA77 is just ridiculously sharp at f/4. Oh well, I'll try and live with it.
A few notes regarding my ringlight. It's not a flash, but rather a cheap-ass Chinese deal I got off eBay. Daylight(ish) fluorescent bulb, about 14" in diameter. I like it because it was cheap, it's light, I can combine it with window light, and because it directly brings me more clients. I don't like the small size, because if I want the catchlights to be obvious, I have to get it close, so can only do headshots.
It's not my favorite type of lighting, for the "flat light" reason that Mike mentioned, though I don't mind the catchlights. But while it's become an overused and inappropriately used tool in photographer circles (much like HDR), it's still not all that common in the mainstream, and people instantly notice the different look. So when I do a high school senior session, I normally send them a few small watermarked jpgs for their Facebook page. Invariably, when they post them, the ringlight shots are the ones that people go nuts over, and about half of my new senior clients ask for it when they come in. Erin is working as an intern at the studio right now, and we decided to do some film shots yesterday. I was only concerned about how the resulting film looked, colorwise, since I am just starting to mess with film, so I told Erin we could do whatever she wanted. She went right for the ringlight.
Just for fun, here's a couple more files. The same shot as above with more radical processing, plus a different shot with a low contrast look that I don't normally prefer, but I was just experimenting. Another ringlight shot, my apologies.