http://forum.zidoo.tv/index.php?threads/feature-request-edid-emulation.81456/#post-134467
HDR in whatever flavour is not about more saturation or deeper blacks.
HDR is about greyscale, it's the wider colour gamuts (P3 or BT2020 vs BT709) that expand the colour range. It's about specular highlights beyond diffuse white, a finer gradation of luma and therefore chroma (although technically that's down to bit depth, it's just that HDR is generally associated with 10 and 12-bit material) and the use of PQ (perceptual quantiser) gamma over standard power gamma for a more natural image.
So if you have an HDR grade that looks say "brighter" or "more colourful" then it's been handled wrong either in post or presentation. If you look at a histogram of correctly mastered HDR content you see that the levels are pretty much the same as SDR up to diffuse white (100nits) and the only substantial difference is the presence of specular highlights beyond that up to a theoretical 10,000nits. And even then the overall APL (average picture level) should be roughly the same as the SDR grade but you get an increase in contrast range and highlight levels.