As you know comparing HFC products to other products is very difficult and frustrating because of the lingering effects of magnetic conduction, and the slow restart up of magnetic conduction.
This forces the listener to rely upon their memory verses a direct comparison A vs B vs C etc.
With that said, here is my personal finding, testing my (standard) Synergistic Research Black power cord to the Cerious Technologies (high current) Graphene Extreme power cord, HF-CT-1 power cord and HF-CT-1Ultimate power cord in the Yamamoto Dac.:
To my ears, I could not distinguish a difference between the SR Black power cord and the GE power cord. They both sounded very good.
The SR Black power cord and the GE power cord sounded as good as the HF CT-1. Maybe the SR Black power cord and the GE power cord sounded a bit more organic. This is where you would have to listen for yourself.
The HF-CT-1Ultimate power cord definitely sounded the better. The music was more refined and had a magical magnetic conduction sound, that to my ears just sounds right and very pleasing.
Based upon monetary expense each of us must decide what our pocket books can afford ;-)
Larry