Ok, so for this christmas eve, here are some comparisons using some brand new settings.
This time I really feel like I've nailed it. I've balanced the gamma so that details in faces and such things are much more visible like in the theatrical print, yet I've managed to keep black and white levels without clipping. Even though dark parts of the picture are slightly darker, it's more gamma balanced and you can still find all the fine grain in the shadows.
So look at these screenshots, they're simply beautiful. And have a merry christmas everyone!
I've also updated the first post with these settings used on all three movies.