Interesting insight, guys. Indeed, there are no formal specs (MTF, etc.) and the web page for the lens is... Rather bare.
As I pointed out in the review, my sample had a distinct front focus. I know it's not the body as I have no problems focusing all my other lenses (including the Noctilux). I had to focus bracket to find the right "fudge factor" and stopped down from there once more-or-less nailed. So there is certainly some possibility that the HyperPrime and the Noctilux test results could perhaps be better - as without "live view" and using an RF is subject to some error.
Also worth pointing out again that I had a pre-production lens (as did everyone else, there are only six in the world) and it was "well traveled." So it might not have been the ideal candidate. How the lens will do once in production, QC (and variation) and so on remains to be seen.
Like all the reviews at LVL, we'll be updating it with corrections, additional info and testing, etc.