Tim,
Just generally most people make audio decisions by listening. Even earlier in this thread when Michael was asked about why he changed his amplifiers, it was a listening decision. And the responder discussed how certain op-amps might sound brighter, and different op amps would change the sonic signatures. Nowhere in this back-and-forth are there precise measurements detailing these changes. It was a brief audio discussion, which is what most people do. Everyone is entitled to their opinions, but it seems it can be rather selective and not necessarily fairly applied to all.
Regards
Bob