The Panasonic as you know, is feature laden. The BenQ supporta an anamorphic lens but can't emulate having one, like the Panasonic's Lens Memory option. That said, not many people are going with either, sticking with the traditional 16:9 (HDTV) aspect ratio screens, instead.
The thing is, when I have both in their "best" modes (and even with Brilliant Color off, and lamp on eco - to try to bring the W6000's brightness down), it's still much brighter than the Panasonic. Viewing them both side by side, the BenQ's brightness draws the eye, and in general, the projector will offer more bang.
On the other hand, what happens, say, if we compare the PT-AE4000 in "Brightest" mode, against the BenQ in "Best" mode?
Very interesting. The Panasonic in that contest, still has the better black levels, and is slightly brighter than the BenQ in "best". On the other hand the BenQ definitely exhibits better, more accurate color.