While the JVC seems to perform very very well in just about every area, I think if one is interested in HDR, they should step up to the X770R or the X970R. Both, have 100% coverage of DCI-P3:
http://www.highdefdigest.com/news/show/JVC/Projectors/4K/Ultra_HD/hdr/wide-color-gamuts/THX/3D/eshift4/price/ces-2017/jvc-details-new-4k-eshift4-projector-lineup-with-hdr-support/37796
I think that color gamut is what we need to aim to hit for HDR. Also, these higher end JVC's don't have the same problem as the Epson's with color filters where it severely limits the light output, where you would have to choose between speculator highlights or wider color gamut.
http://hometheaterreview.com/jvc-dla-x970r-d-ila-projector-reviewed/?page=2
DCI-P3 is the color gamut most films up to this point have been mastered for and even most films that are coming out now. There are only a small number of films that try to expand the colors past DCI-P3: Inside Out, for example, had one scene where they put the colors out to the edges of Rec. 2020. With the current technology I don't want to go out past DCI-P3 if they are using narrow-band primary colors (like with lasers or quantum dots). Getting out to the edges of Rec. 2020 in this way results in "metamerism", where different people perceive colors differently, even on the same display. For this same reason I can't see a big push for Hollywood to start color grading films past DCI-P3, if they know that each person might perceive images drastically different.
Hopefully in the next gen JVC projectors we will see either the performance of the X770R come down to the replacement for the X570R, or the price of the replacement X770R to drop below $5,000. That is when I will be ready to jump in. If they have that, I can see it being a good projector for several years, whereas if we jump in with the X570R we will be looking to upgrade much sooner.