Just hooked up the 8500. The good news, the iris on this unit sounds quiter than the 6500.
The bad news, there are appears to be waivy lines and such on images (on faces, and other surfaces) from time to time. It doesn't happen often, but they are there. It happens mostly on brighter scenes. Also, I don't think the skin tones and colors are as real as the 6500. The 8500 does have incredible blacks and when the artifacts don't show up, the picture is fantastic (especially on high def). The artifacts are ruining this pj for me though.