Reinhard is the worst thing one could want a render tone mapping ask for, just look at nuke ,arion fx, octane they have camera tone responses this is what corona should aim for , try to mimic real cameras or film . for example old films have very nice color tones that now alot of digital photographers want to emulate and most of the renders images without post processing look gray , dull, lifeless this is why i think this is one of the most important features any render should aim for to become a real camera there should be no need for us to even use post production outside of renders.