With help from our mates at Flanders Scientific, we've been looking at display calibration for PQ based HDR.
The present method used by most calibration systems requires the PQ EOTF to be disabled, and a default gamma 2.2 used.
The results are not optimal, as the difference between a 2.2 gamma, and the PQ EOTF is just too great.

Thanks to the a**istance from FSI, and Bram in particular, we now have a far better solution for ColourSpace...
See: https://www.lightillusion.com/forums/tips-tricks-17/limit-range-unique-approach-to-pq-hdr-calibration-778.html

Steve