@jinjuku,
thanks for the details! So far I could only compare Audioquest's Forest Ethernet cable with a standard Cat7 cable. There was a clear difference. But I will do a blind test when my girlfriend is back and report.
System with which the test was done: mac mini with a Mojo external power supply, ayon NW-T network streamer, AQVOX switch between the two, ayon CD-35 as a dac, Einstein power amp (Light in the Dark), Einstein The Preamp, Verity Sarastro II and a bunch of cables.
I think that especially if you do not use a high-grade (external) linear power supply for the computer (as server) you already get so much noise in the signal path from the computer's internal switched PSU that exchanging cables does not make a difference. When I switched the internal PSU of my mac mini with the external Mojo PSU I got a huge leap in sound quality.