Shiny is not a technical term with a clear definition, but I know when somebody says one thing is shiny and another is not, they are combining two separately measurable quantities.

How blurry is the reflection? (eccentricity)

How bright is the reflection? (reflectivity)

More shiny means more bright, less blurry. More reflection, in a smaller space.

More dull means more blurry, less bright. Less reflection, in a bigger space.

In one of your shaders, you only modulated the blurr (eccentricity). In the other (the two-Blinn shader) you modulated both.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)