I have received my Noir Hybrid HPC for my Oppo pm 3 quite a while ago and having been comparing between the stock cable & with the noir.
At first it was quite difficult to tell the difference but going through my music and some couple of days later, the bass is more detailed, having a slight more impact & with the treble just extending just a bit more compared to the stock cable. Vocals i found to be slightly a bit better on the stock cable, female & male vocals just have more air to them compared to the Noir which has less air with male vocals but manages to have some air to the female vocals.
The thing i noticed with the Noir cable is that they have a much bigger bass body that hits slightly harder which in turns can take away from the vocals of the oppo pm 3, with the stock cable the bass is not really dominate which allows you to listen to the vocals which i prefer because of the added air to them.