Just to recap, let me list the reasons why a x100 is different to these cameras:
1. the real viewfinder (not an expensive mini-TV that you buy separately and destroys the form factor of your camera - which is the main reason one bothers with m4:3). In fact you get one of those mini-TV's too, but built-in, not attachable.
2. the quiet leaf shutter with crazy sync speeds
3. the bigger sensor with better dof control and high ISO capabilities,
4. the manual controls
5. the 35/f2 combination which is the most popular lens and still doesnt exist in m4:3 or NEX, let alone exist in such a size
6. The distance scale which enables hyperfocal shooting for landscape and zone focussing for street.
7. Seeing outside your frame in OVF mode, like a rangefinder. Awesome for moving subjects.
8. Electronic overlay in OVF, which means histogram, dof scales etc. Not even DSLRs have that in the viewfinder.
As for the p&s comment, what can I say. It seems the popular internet forum rule is that if the camera doesnt change lenses its a p&s. Not to be rude but there's only one answer to this: whatever.