Thank you everybody. Taking all in.
rbelyell, Luke, I'll check out the X100 more.
What makes the choice harder is that I don't have the possibility, as Americans do, to play with the camera for a while and then make up my mind. I have to make it up with research and opinions. Luckily, I have some time.
To try to make it easier I'll take the money issue out of the question since I'll not have to make a big sacrifice to buy any of them. So price is out of my decision criteria. No matter the RX1 is double the x100s or 4x the X100, I'll only consider the other factors.
What I want is a camera that I can take some pictures that give me great satisfaction in the long run. I'm still very fond of the pictures I've taken some 15 years ago with a very basic 35mm SLR Pentax with its original ZOOM lens. I understand that the gear can not make up for the artisan behind it (I'm a professional filmmaker), but I am sure that with my so so knowledge that camera improved my photos a lot from previous 35mm and gave great pleasure. In the end, it was too big to carry on my trips,
film died (kind of, I know), but now I want to get the same sort of satisfaction in digital in a smaller package. That's why I came down to these cameras to compliment my RX100M2. Sorry for the ramblings, but just for the sake of sharing my frame of mind concerning this purchase.
So, I'll keep taking notes on all your helpful insights. At this point, I now have 3 cameras to consider as opposed to the initial two! kkk And I'm not making fun of the suggestion, just smiling at the nature of research: the more you research the more complicated things may get!
Thanks again for the willingness to help.