I think the nenox is a statement knife. It has a unique shape, super cool profile, super nice fit and finish, and looks different from most Japanese western handle knives out there. It is for those who may not need to have the sharpest knife, but a different status type knife. It is up to the person's preference. Most people would say that the knife just looks cool. Also most cooks out there are not sharpening their knives and looking at the edge under a 10X loupe. To them, it is just a tool, that gets their job done.
Anyway, I have a nenox and had the hattori FH both in 240mm. Although I cannot definitively say which steel last longer, the VG10 or the mystery steel, I do know that when I sharpen them both together, the Nenox steel felt harder, and definitely different than the hattori VG10. I don't profess to say that it is a scientific sharpening test, but that was how it felt.