Actually a main point they talk about in the video is not sound but "feel" or that "low mid speaker interaction growl - kind of thing". Something that makes only the player happy but nobody can hear. According to Rabea the QC is a new milestone in this respect. Let's wait and see...
We should take what Rabea said with a pinch of salt for now. He wasn't invited to test something and say hey this is a mediocre thing. I'd rather stick with a helix or a kemper.