Yeah I wish it was scene by scene like JVC then it would be excellent, its not just the tone mapping in the Epson, its waay brighter too which has a huge impact on HDR.
I used madvr on the JVC and yes its was great.
As DTM is mostly tweaked by eye its impossible to compare.
Lets take a Epson TW9400 with a native contrast around 4000:1 thats the window you have to work with for DTM, yes its a bright projector, however thats only relevant to screen size. so if we set the max lightoutput to 20fl on screen and tonemap for that, you have from 14-20fl reserved for highlights/ the dynamic part of the movie, vs a SDR mastering, on the epson thats a limited reduction of contrast, maybe 30% but as its already fairly low its not experienced as making much of a difference.
Now you take a JVC X3 with 15000:1 native contrast, its has much less lightoutput, but as thats a screen size thing we put it on a 1.3 gain 100" screen that will give you around 26fl, some headroom for lamp dimming and closing down the iris, ill estimate calibrated contrast around 20000:1, thats a much bigger dynamic span to tonemap to, now you come closer to the dynamic of the SDR mastering, however since your already used to a 25000:1 contrast with that projector with SDR content, dark scenes will to some extend look washed out in comparison, the higher light output will for a time help to blind you, so that you will not notice right away on dark content. Problem will be Harry Potter in HDR.
With high contrast projectors you can get away with calibrating a higher SDR gamma, gamma is the parameter that makes for the biggest difference in how you perceive the content, higher gamma will make colors look more saturated, to high gamma it will look oversaturated, and a low gamma will make the image washed out, with lower contrast projectors you can not get away with a 2.4 gamma its simply to shallow out of black, and the differentiation will drown in the high black level.
If you apply some of the same methods to SDR as we today do to HDR we apply to no standard, you will be able to tweak the gamma curve to your personal preferences, a bit like setting the projector to its vivid mode, its just a very different color and gamma setup, makes it look completely different.
So as long as we all uses different projectors, have different preferences, and apply wild west settings for DTM, nobody knows what who is watching, its most likely that everybody here have projector setups with DTM that is pointing in as many different directions as there is participants in this thread.
Not even as simple parameters as calibrated lightoutput and black level has been shared once in this 9 page long thread.
What is the ideal outcome on a subjective discussion like this? How can we relate to someone else when we have no idea what they are working with, if you go to a car forum there would be tire sizes rim sizes engine specs and all sorts of detailed information going around, here the most basic spec such as screen size barely mentioned.