I hate to bring this up, but in my experience a fuse upgrade results in greater sound benefit than a power cable upgrade. The fuse is the bottleneck of the unit. Open up that bottleneck results in a much more noticeable improvement than the kind of power cable used. Anyway, that's all based on my experience in the house of stereo. Here is the journey I followed at improving sound:
1. Built a soundproof listening room.
2. Installed acoustic treatment.
3. Buying / selling audio equipment until I found the right sound to my ears.
4. Used isolation on every component.
5. Upgraded all cables, interconnect, power, speakers.
6. Upgraded fuses.
In the end, the least noticeable sound improvement was my power cables. Granted I live on the outskirt of a small town of 5,000 people with underground power lines offering a very stable feed. Additionally the house of stereo has a completely separate power feed from the main house. Those are likely major factors contributing to my experience. I have zero doubt that power cables can be beneficial upgrades since there are many respected audiophiles who enjoy excellent results. So many ways to skin a cat. It all comes down on how you choose to go at it. Enjoy the journey.