HDTVExpert has a review of the Sanyo PLV-Z4 which has received much praise from other sources. It has some great up-close pictures of the projector, and a good review.

Mr. Peter Putman thinks highly of it:

The PLV-Z4 is one of the best HD-resolution LCD projectors I’ve ever tested and a big step up from its predecessors. Color quality is improved - it’s as good as the Panasonic PT-AE700U — contrast levels are up, and grayscale tracking is getting better. The dynamic iris has a lot to do with it, but so do the expanded color controls. Dynamic irising is all the rage now; numerous LCD projectors and some LCD rear-projection TVs have incorporated it to kick out better black levels.

HDTVexpert - Sanyo PLV-Z4 Widescreen Lcd Projector