Got the FTZ-II without delay here in Norway as well.
For some F-mount lenses, the Z9 handles better with the Mk.2 FTZ, an example being the 300PF. Otherwise it is largely a cosmetic change although truth to be told, the F Nikkors frequently look sleeker and more in line with the Z cameras when they are hooked up via the new adapter. My Noct-Nikkors definitively gave that impression on the z9.
For my studio macro and close-up work, the old FTZ is better suited though, as its tripod mount confers better weight distribution for lenses such as Laowa 25mm f/2.8, Olympus OM 38mm f/2.8, or the various 55-60mm Micro-Nikkors. I have no plans for "updating" my existing 4*FTZ.