Aside from the successful samples I've shown above, I didn't have much success with Sharpen AI yet.
In most cases, Sharpen AI adds (in-paints) new detail, introduces micro-patterns that are foreign and that kills authenticity of the image.
This gets especially evident when image is enlarged for printing.
Also, in most circumstances I see a sort-of a tiling pattern. Not always rectangular, and not always with sharp edges/transitions.
If de-focusing large skin area, where part of the skin is in focus, Sharpen AI results in blotches of areas of improved sharpness intermixed with un-sharpenned areas. This creates rather a chaos in the image that no longer looks naturally focused/sharp/captured on camera. I hope these bugs would get sorted out, as it looks promising.
I would highly welcome de-focusing/sharpening with user-selectable option that could
1. avoid in-painting detail that did not originate from the same image and that could be
2. applied uniformly to the image for further manual masking.