Regrettably, I have returned the UHL55 that I received last Thursday. I set it up in my light controlled theater room with a 100" 1.0 screen. I also used it in my LR with a 106" HP screen. There were two reasons why I returned it:
1. As measured on the French site Passion Cinema, the Contrast was around 332:1 calibrated and 428:1 Cinema OTB. This showed up in many different scenes to include some HD programs and commercials that were definitely not low light. There was quite a difference between the UHL55 and my LG PF1500, a four year old LED HD projector. I used Gregory's settings and the various OTB settings, adjusted various parameters, brightness, contrast, gamma, etc., and could not get it to a satisfactory level. The 4K HDR from Netflix and You Tube was excellent but this represents only about 30% of my viewing.
2. The up-scaling from any HD resolution to UHD was not up to par. I was able to run it through my Denon 602 video processor and my Darbee and that gave me an excellent upscale but still had the black level/contrast problem. However, in this scenario I would have had to run two cables from a 4K splitter to the projector and my extensive experience with that and long cable runs has not been pleasant, and I didn't want to live with that scenario.
I could have brought in an ISF calibrator and hoped he could get better black level/contrast but my experience told me he couldn't have enough impact on the image. That being said, if something came up that would change things I would buy this UHL55 again. Everything else was fine. The 4K image was excellent in general. I think the problem is one that has been brought up in other reviews of these .47 projectors. There is something in the design and execution that is different from the HD versions of the same chip, like the one in my PF1500, that produces poorer blacks. So far, based on my reviewing many threads here on AVS and pro-reviews, it takes a combo of the .66 chip and an active iris to generate acceptable blacks and contrast. So I have to decide whether I want to increase my outlay by a factor of 2.5.
I'm thinking about it.