Thanks for catching my typo. I hope to spend considerable time with one very soon. It will be interesting to see the contrast improvement with an aperture plate addition.
As for even with a blu ray source, it is only a 2K machine and there is no point in feeding it a higher resolution source. What the point is feeding it a true 2K DCI source. Its a DCI machine, that's why it costs so much and I think no matter how great it throws a blu ray source, the only point of the machine and investing in it is for very large screens with DCI source material. For a smaller screen, say less than 12 ft wide, the light is way more than one needs and no matter the small size of a fixed stop to cut it down and increase the contrast, the contrast won't approach what less expensive machines can throw. Its for the big boys who want say a 16 ft wide, unity gain screen, and a substantially better picture then they could see in the best commercial 2K theater. The color space is substantially wider and that to me is a primary point in going for a DCI machine, That and the ability to see the same sources as a commercial theater shows. Its not a purchase the hobbyist should stretch for. It fills a need at for a big boy what is a very reasonable price. At a noise level of 54 db, you need to isolate it from your media room or dedicated theater watching area.
The lens must be selected for the application (throw distance and the screen gain already in place unless starting with a new screen).
Almost every projector out there shows a great blue ray image. The key is the set up, the room conditions, and the right size and gain screen. This means NO gain higher than unity. Not 1.1, certainly not 1.3. Not for this machine unless you are going for a 28 ft wide screen or so.