@facten I am design engineer, and my job is to actually measure components including all cables etc to make sure performance spec is satisfied. As I see typical power cable resistance is about 3 mOhms, expensive one is 2 mOhms, including wall outlet and device connector. Some very good quality components have power cable attached, which does not make them less hifi.
Information about “blind test” results, where expensive power cable superiority confirmed vs stock cable would be welcome.