Massvm; Maybe the worms are loose? I'm certainly no expert in these technologies, and my observations were based on listening tests rather than on engineering considerations, and I'm comfortable with that. But I do think there are average copper wires and excellent copper wires (ie, ICs and speaker cables).
Aren't there both glass and plastic fibre-optic cables? If so, that could be an important difference, and I think the connectors may be important as well. Electrons may all be alike, but behave differently in different type/quality materials? Yes? Same with photons? The Kimber Toslink cable has more positive connectors. Cheers. Craig