Trouble with the subject is, aside from the "it was a third better" type of subjective opinions we are generally into 'pretty subtle difference' territory. I mentioned this in another thread, you can very quickly disappear up your own when you are not only listening for change but also for improvement. I went to and fro with mains leads, speaker leads and various digital interconnects to the point where I decided I could get more consistent repeatable improvements /changes to the sound by changing where I was sitting/moving a speaker 10cm, drawing the curtains , moving from Clarity capESA to MR etc etc. I liken dealers who demo expensive cables, magic crystals or what have you in your home to doctors selling you cosmetics for Jaundice-if they were genuinely interested in improving your sound they'd be prioritising monster room modes/flutter echo etc.
When asked to list systems there seems to be 2 types of audiophile, those that just list their components and those that include all the interconnects, cable lifters, power leads, obsidian turntable feet crystals etc