The low light perfomance is still great and if you ask me to bring just one camera and lens out, my first choice is still X100 with the fixed 23mmmf2 lens. My other XT1 with various lenses will be my second choice or for more specific tasks like the important event or nature shots.
The X100 or it's newer models to me is unreplaceable by any X mount cameras w the similar 23mmf2 WR lens. These are the reasons:-
1) The X100 fixed lens has a slim profile
2) There is a built-in 3 stops ND filter which is very convenient. Just a pres of a button to cut off extra lights.
3) The Marco mode of the x100 is much better
4) The 23mmf2 lens on X100 can turned into a 18mm or 35mm lens with add-on of the coversion lens.
The X100 or it's newer models to me is unreplaceable by any X mount cameras w the similar 23mmf2 WR lens. These are the reasons:-
1) The X100 fixed lens has a slim profile
2) There is a built-in 3 stops ND filter which is very convenient. Just a pres of a button to cut off extra lights.
3) The Marco mode of the x100 is much better
4) The 23mmf2 lens on X100 can turned into a 18mm or 35mm lens with add-on of the coversion lens.