Sadly our judgements can be faulty, though.
My initial reaction on hearing the aforementioned Nordost was that it was more open, better bass (minor degree but just audible). It was only after several listenings I realised what it was, and when I tweaked the volume a minute amount, found it sounded the same as the rest.
The other problem is that invariably we test products at higher than normal listening levels. My initial response was that all the cables (threw in the freebie later) sounded better than the ones I'd been using. However, when I included the old cable, and listening at the same volume level, I found it just as good.
It seems to me pointless to throw too much money at interconnects. All you need to do is to make sure what you have is well-made, and stop there.
It's a bitter pill to swallow, but it is the equipment that makes the difference, not the interconnects.