@lollipopguild "I’ve actually found a set of Golden Cross XLR second-hand.."
I was a GC diehard for a few decades, probably the absolute most lush cable Cardas ever sold. That is the other end of the spectrum. Later came Clear lines. GC was also one of the most complex and labor intensive to make too. All three of my GC pairs went to Pass Labs owners with certain amps and speaker combos that were "too bright" in their words. Sibilance can also start at the source, AC power, DAC, etc.
Once I moved to better DACs, power supply, and a good 6SN7 tube preamp, parted with all three pairs of Golden Cross to the next happy owners. You’ll have no problem reselling the GCs later if you choose to down the road. Should be a good comparison for you. IF GCs are not extra lush, something else going on there.