Older Cardas were markedly warmer. Over time Cardas has moved to more detailed and transparent wires. Additionally they also have a sound characteristic hierarchy of more neutral ( brighter / detailed) the higher level the interconnect. The logic is that low level components tend to be bright and perhaps noisy (high noise floor) and will sound best with warm with a bit of attenuation of upper frequencies wires. As you get into more expensive components they need less and less warmth and the wires are more transparent and detailed.
For instance the Schiit Yggdrasil is a bit hard and brittle on the upper frequencies, so Cardas Clear Reflection is a good fit.
Even at the very top end of Cardas there is a slight warmth to them. As my system got to be very high end, I had to switch to Transparent. Transparent are, well, transparent. They can be too much for lower tier stuff. While I recommend Cardas a lot and respect the brand tremendously, they no longer work for me.