I'll jump in here because I just had Chad out to my place last month.
Over a period of a couple visits, Chad created three modes for me on my RS500:
-SDR 2020, using 2.4 Gamma
-HDR Low lamp, using custom curve
-HDR High lamp, using custom curve
Prior to the visit last month, Chad hadn't been to my place since I picked up the UB820.
Before I had the UB820, I had the UB900 paired with a HD Fury. Eventually I dropped the Fury and just used the HDR custom curve Chad created for me.
The low lamp curve was good, but still a little dim for me. I simply boosted the slider to give me some additional brightness.
The high lamp curve was awesome, but due to my room setup and projector location the fan noise was more than I wanted to handle.
Once I got the UB820, I went back and forth between low lamp HDR and my SDR 2020 mode. The difference was so minor that I stuck with the SDR 2020 and turned on the Optimizer.
I had Chad take a look and give me his opinion based on my setup.
I have a Seymour XD, 115" 2:35 screen, so I am still starved for brightness due to the gain and the screen being AT.
Chad and I agreed that the best option, for my room, was to go with the SDR 2020 mode with the "slider" bumped up to +5. He ran some tests using his calibration tools and said I wasn't crushing blacks and we both thought the picture quality was great!
If I am ever able to tolerate the high lamp mode, I will use that over what I have but even Chad things the new UB820 tone mapping is a great product....especially for my generation of JVC projector.
I watched Aquaman and was really happy with how good the PQ was, overall. I thought maybe one or two scenes had a slight overly bright whites, but everything else was great.
IMO, I agree with Kris in regards to the benefits of using the SDR 2020 mode with low gain setups like myself. I simply don't have to play the "what if" game.
For the first time since jumping into the RS500 3 years ago, I am thrilled with my video performance in both 4K and standard Blu-ray. I plan on keeping this projector for at least another year or so, depending on if it has any issues or goes out on me.
Just my two cents.