The Very Bottom Line on the XV-Z30000 projector
First of all, here's a DLP home theater projector for those of us who are rainbow sensitive. It's rare I can watch a movie on a DLP projector and not notice rainbows from time to time. Didn't notice a single one last night watching Pirates of the Carribean, and it's got plenty of darker scenes that are good for spotting those pesky rainbows.
This Sharp will slug it out with other DLP projectors like the Optoma HD8300, the brighter BenQ W7000, and the slightly less bright Mitsubishi HC7800D. From that overall brightness standpoint, also add these to the list of most direct competitors: The $3K - $5K LCoS projectors be they JVC or Sony.
The rest of the competition is more different - primarily those really bright 3LCD projectors: Epson's 5010 and 6010, and the Panasonic PT-AE7000. Those guys have the big advantages of being able to move out into the family room with lots of lumens, but are great in theater too. They have what the Sharp lacks - enough brightness to have a reasonably bright 3D image on a decent sized, typical screen.
All considered though, it is a fairly elegant projector. No rough edges that I've noticed so far. And don't forget you can go wide screen, thanks to lens memory.
While this Sharp XV-Z30000 may seem very similar to a few other projectors, personally, I'd choose it over two of it's closest competitors - the Optoma HD8300 and the Mitsubishi HC7800D, for my own use.