I thought about the old model Z4 before getting the Zed, they're about the same price and the Z4 is much much less girly than the Z3, but there is something about the Zed that just screams at me and makes it a more masculine car. I don't know if it's the huge fat ass, or the fact that it's a coupe rather than a drop top, or even if it's easier/cheaper to modify than a Z4, but I haven't even looked at the MK1 since. Now the MK2, thats another story, it's beautiful in Alpine white and looks pretty aggressive, but the only problem is the price for me and the fact that the only ones reasonably affordable to me have baby engines.
The last thing to note is this forum, not just the fact that many members with much more experience than I have said it's the best car forum they've been on, but most people are pretty honest when it comes to other cars. It's not a "it's not a Zed so its @*!#" type of forum, but lots of people flame the Z4 and praise many many other cars, so I'm pretty certain it something I should stay away from.
Main thing is you like it and you're happy with it, though.