Skip the Z5 .. just Z2 Pro and ZFX. I have some ZFX nearing the end of it's shelve life, PM me if you want a sample to try it out.
Right now I'm testing Z2 Pro against the old Z2 and as a common reference for non Zaino users I applied UPP to a 3rd panel. There is no discernable difference in the look of Z2 Pro and UPP during the first few days and although UPP is slightly slicker it is close call. After a week of bad weather and two washes, Z2 Pro is way more slick than UPP, the shine is better than the UPP and unlike the beading and sheeting ability of UPP, which dropped off very rapidly, Z2 Pro is still going strong.
Join the hive! Life is good in here! :lol