I don't notice anything different form the new Z2 pro and the old Z2. I havnt had it on for a long time yet but i here the new Z2 Pro has a greater durability. As far as a glossier or wetter appearance I dont see it. The old Z2 is easier to remove if you ask me.
Z1 or ZFX? ZFX is a far better application method. Allows up to 3 coats in one day. I wouldn't even bother with the Z1.
I find the Z2Pro is slicker, and a little bit wetter than the old Z2, but nothing drastic. It is supposed to last longer, but I think most Autopians would redo their cars way before it would wear out.
With any Zaino formula, be sure to use very thin coats, otherwise it can be a pain to remove. Use the Z1 with your first coat, and if you can, let it dry for a good 30-60 minutes in the shade or garage. Here tips right from the source: