I've nothing new to add, really, but as a former v9000 owner, I thought I'd chime in.
I loved my Sharp 9000, but it was handily trounced by the Sony "ruby" (VW100) with which I replaced it, and more-so by the VW85 I have now. Given that the HW50ES throws at least as good a picture as my VW85 (from what i've read) I think you'd be stunned by either the sony of JVC. Honestly, even the sub $2000 1080p projectors would seem mind-blowingly good by comparison, things really have changed that much since 2001, when the sharp was state-of-the-art.
What content are you viewing? If you do any gaming, you'll want the ultra-low lag of the Sony vs the JVC. I'd love having a JVC's superior native contrast, but the video lag is a deal-breaker for me.