Great, now I can compare it with other Zsomethings. But as the post shows, thats just one branch of many naming schemes HP employs. Also: This already is a workstation, how could it _not_ be "ultra"? Why the doubling? Or does "workstation" just mean "something I can work with", including office stuff? In that case, I am very interested what other letters they use and what they're for.

For the same reason there is the Z2, Z4, Z8. There are several tiers of workstations, the Zbook Ultra is the best PC laptop you can get in a non-boat-anchor format, bar none.