Without being a car enthusiast these are clearly not in the same category to me. I have hard time believing anyone being close to an X would not feel it: it is much higher. You feel much higher on the road seating in it. It is less clear cut between S and 3, but driving them is making you feel how much larger/bulky the S is (having to fit luggages in the 3 is also making you realize how smaller it is). And S wouldn't fit in my garage while my 3 is fitting just fine :)

I mean unless you're not a car person to the point of "it has four wheels, it is a car"...