ChadB's calibration was fantastic but my system's calibration preceded the new Gamma curves. Chad gave me one fantastic curve but it was much less bright than the new curves I would read about and now have.
Gregg was familiar with the hack but the end adjustment for a Dolby Vision setting versus HDR10 setting was to decrease red (saturation, as I recall) of the HDR10 mode and to label it as Dolby Vision- but worth asking him for specifics. No red push with my sources. The Vertex 2 automatically switches between SDR/HDR/Vision in the JVC using the RS232 connection.
I use Panasonic 820 for discs. I have Roku Ultra, Fire TV 4k and Shield TV... to Apple TV 4k two days ago. I've migrated in that order for my streaming. Each box had its issues. The Roku Ultra had lots of trouble with interfering with startup and shutdown for my JVC and often had trouble maintaining good connection over HDMI. Software updates would screw things up, frequently. No Dolby Vision, often no Atmos. The Fire TV 4k just not enough options for adjusting color space and refresh rate. Shield TV seemed great but would not convert all to Dolby Vision and was finicky in what refresh rates and color space were available with settings on the Vertex 2 for getting the Dolby Vision displayed. The Apple TV is blowing them all away and I am sad that I didn't try it sooner.
I have locked everything to Dolby Vision 4k24 for output from Apple TV. I now no longer have to deal with RS500 slow switching between color space and rarely with changes in refresh rate (4k50 material comes to mind). My home page is Dolby Vision, SDR output as Dolby Vision and my HDR10 is converted to Dolby Vision. I leave lamp on low until a movie or show demands it, to my eyes. I do not know if I will stick with always on DV but it makes my system so easy to use and much more wife/children acceptable due to no dreaded delays in switching. I want as much as I can in low refresh rate primarily because the JVC cannot do Anamorphic setting for 4K60 and I like the image/flexibility of my anamorphic lens.
The Roku has been around in my house since the Ultra came out, but the Fire TV stick and Shield are newer and had their issues. Again, too bad I held out on the Apple TV. It also doesn't seem to hang my receiver and projector with shutdown, so the Harmony remote sequence is much faster. I currently have a 4 second delay forced in the JVC shutdown. This supports shutdown with the other streaming devices and I'm itching to remove the delay to make shutdown faster for the AppleTV. I might have to occasionally use the other devices, so still resisting the urge. I suspect the Panny 820 won't release HDMI connection fast enough, so further reason to keep the delay.
The Panny 820 with Dolby Vision discs is very similar on the screen to the Apple TV Dolby Vision. I don't feel I get much better on disc versus streaming now but I haven't spent a lot of time testing. I do feel the perceived quality of image from the Apple TV is better than the other streaming devices. The 820 will not convert HDR10 to Dolby Vision. The Tone Mapping adjustment on HDR10 with Panny 820 is probably as good or maybe slightly better on the screen than the same HDR10 converted to Dolby Vision by the Apple TV, but I would need a lot more testing to confirm; testing that I probably won't do.
My movie catalog is accessible through Amazon, Apple and Vudu through MoviesAnywhere. I like Vudu but using AppleTV through the AppleTV+ to display the MoviesAnywhere titles might give slightly better image, but I need more testing. Some of my titles are on Vudu only because some distributors do not yet have a contract/arrangement with MoviesAnywhere.