high quality counterfeit would generally be taken to mean a counterfeit that is passable as the real thing, with a higher quality counterfeit being more passable than a lower quality counterfeit, and a higher quality counterfeit requiring more skilled experts / tools to differentiate it from real notes. Thus it seems nonsensical to say a counterfeit can be higher quality than a real note, since being anything that differentiates it from a real note would make it identifiable and thus not a perfect quality counterfeit. I didn't realize you were talking about the quality of the images printed onto the notes, I thought you meant the quality of the counterfeit notes.