The ZBook family of mobile workstations is home to some of the most configurable professional systems in the market. The 2019 refresh will get Quadro RTX GPUs, Intel 9th gen CPUs, and a more color accurate panel not found on any other 17.3-inch workstation currently available.
https://www.notebookcheck.net/HP-ZBook-15-G6-and-ZBook-17-G6-coming-with-world-s-first-100-percent-DCI-P3-display-and-Quadro-RTX-5000-graphics.422032.0.html
1) Only noticed now it has an optical bay... *drool drool drool* (don't @ me :P)
2) You sure hope the performance is full and unthrottled :P i9s are ovens, no matter H or HK