I love going to stores with my ABII. I can sit here on the forums all day and dream of a Z3, but when I play it next to any other bass, I'm completely satisfied.
I went to a couple yesterday, and the only two that even compared were an AB-I 4 and a Pedulla Thunderbolt 5 ($2900, GC). The Pedulla sounded pretty good, but if my ABII was a 10, the ABI was an 8.5 and the Pedulla was an 8. Just killer.
So while I was at GC, the head bass guy (John Myung's college roommate) came out from the back because he could hear it in there and it sounded amazing - through the walls!

Sheldon makes the best instruments in the world, hands down.