Yes! Just read this post (translation via google)
Long story short: there has been an issue with the position of the caliper. On many QX frames the PM adapter was welded in a wrong position. By uning a bigger rotor ans a custom adaptor it is possible to get the caliper in the right position.
Problem: (post 48)
Solution: (post 58)
P.S.: The brakeholder is standard, it’s just PM (Postmount) standard instead of IS2000 (used by KH)