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I agree somewhat, but depends on the movie you are watching. DLP's process the image differently, and different movies have different types of lighting techniques and just look different on different projectors. I usually prefer my JVC over a DLP, even over a Runco, but not always.
Though this goes against common knowledge, theoretically, dynamic IRIS's by using dynamic GAMMA can increase intrascene contrast at times when a scene does not have the white peaks near the limits of the gamma curve, it does it because it's essentially "exaggerating" the intrascene contrast of a scene that was not mastered or filmed to have high intrascene contrast because the gamma mastering was done at a more limited range for that scene. This is essentially sort of like Brilliant Color on some DLP's, but it's exaggerating it even more. Realistically though as films have gotten cleaner and better mastered, the DI's hurt the scene as much as it helps at times, because high intrascene contrast are much more common than before (because scenes are much more enhanced). Hence, the gamma corrections implemented with IRIS's can move the gamma around more if there is more room in the first place in a given scene (theoretically speaking). Think of it this way, compare a current Sci Fi movie like Oblivion to one in the 1950's, which one typically shows better contrast, exactly. In a way, you could say that DI's might actually look better on old movies so to speak where they have bad gamma mastering. For the most part, the DI does affect the peak whites as long as the gamma spread in a scene is there in the first place.
Though this is over-stating / over-analyzing, realistically the DI usually hits the white peaks in the scenes when we need the DI not to, because those types of scenes where the DI's kick in the most are often starfields or similar, and that's where it hurts it. Another complication is how bright you are watching the movie, since brightness is not linear, neither is the way we perceive contrast. So at times an IRIS might do a nice job while in other scenes it falls flat or looks too noticeable simply because of the way our eye perceived it at different brightness levels.