"Another case of "I bought and installed the new cable and the sound improved markedly!" Unless you did a blind test with someone helping to make the switch all bets are off! As Perry Mason would say "Not admissable in Court"."
What is your argument Perry? That the OP can't hear an improvement in the sound quality when he replaced a component? Or that swapping out a cable doesn't qualify as an audio comparison?
Seems to me that this hypothesis flies in the face of everything that goes on with the members of this site. Perhaps the problem is that you are passing judgment on someone based on your own inability to hear a change in your system.