So, dudes & devs:
thanks to a hint from our buddy CJWIDD, I switched to Dubcat´s ACES simulation HC 0.7, etc.
After tens of renders (interiors) in the last days, this will stay standard setting for me... despite the stronger burning in the highlights.
Renders (contrasts, gradients, etc.) look waaaay more photo-like and more natural to the eye with HC 0.7. Especially in small rooms with poor light sources, you get much more energy.
Details that looked totally washed out at HC 1 and above, suddenly appear and the lighting becomes natural and alive.
In my humble opinion, the base setting of the HC in Corona seems too high. That's why images always look rather washed out & grayish and one messes around with contrasts to compensate it - with the known side effects of color burning, etc.
HC lower than 1 as a standard and a better / stronger effect of filmic highlights, so one can reduce clipping to a natural degree when needed, would be perfect in Corona.
What do you guys think?