Originally Posted by cpc
...Did the sharpness depend in part on the use of lcd tech? Will a switch to LCOS cause a slight reduction in Mitsubishi pj sharpness when comparing HC9000 to 6800/700 etc? Whatever the case, it is possible that an HC9000 could be one of the sharper LCOS projectors. This combination of high contrast tech and high sharpness will be very tasty for many projector buyers.
I think the initial picture quality produced by the Sony SXRD panels is quite good. The problem is that they are apparently much more susceptible (e.g., relative to the JVC D-ILA panels) to degradation arising from exposure to heat and light, particularly light in the deep blue-ultraviolet range. This may be a result of Sony's optical block design around the panels, but it is typically the panels themselves that must be replaced in rebuilt optical blocks, at least in the rear-projection TVs (I'm not sure about the front projectors).
Sony apparently made several attempts to redesign their optical blocks from the initial introduction of the SXRD TVs in 2004 through their abandonment of the technology in TVs in 2007. Early on, they recognized the UV sensitivity of the panels, and it was revealed in a class action lawsuit that they had attempted to increase UV filtering and changed the amount of a specific compound in the panels to help make them less sensitive. However, the newest models are still failing with the same types of issues as the earliest ones, but the failures seem to be delayed until higher numbers of hours are reached. For details, see my informational web site (link in my signature).
Perhaps LG has done something else in its optical block design to prolong the life of the panels, or perhaps the panels they intend to use are of a completely different design. I don't have any direct knowledge of this, and I don't want to propagate bad information. It's just something to be aware of.