In early 2011 I upgraded to the JVC DLA-HD950; and I have to admit the difference was subtle. I convinced myself it was better (probably to justify the cost) but in reality it wasn't noticeable by anyone else and hardly by me, if I'm honest. I even paid to have it calibrated by Jeff and while that made a difference in picture quality, it still didn't put the projector in a different level, in my opinion.
This past week I upgraded to the Sony 1000ES. I had seen it in person at my local dealer but since I couldn't see it on my screen/in my theater I wasn't sure if it would provide a noticeable difference.
I just want to let others know that it is a different league entirely. Incredible clarity, depth, and brightness. Best upgrade of technology I have ever made!
For anyone else who currently owns a JVC DLA series projector, I really do recommend the upgrade to the Sony if it fits in your budget.