I'm prepared to share my first findings about this shader.
While it is by no means a scientific experiment; it is a comparison.
I chose to use Judy for this; because I've always liked her default skin image.
I created a zip, including 3 comparison images, 2 versions of the shader in mt5 format, and a text file of my ramblings... I mean findings.
I wanted to attach it here; but it was too big. So; if you're interested in this send a private message to me here, and I'll get a zip to you.