There's no comparison here... If you call a photo enthusiast or more, which by default you do since you are on this forum, you ought to pick the X-T1. It is much more capable in every aspect. I don't buy that put your camera in your pocket thing. What do you do with your hands then? Throw obscene gestures at passer by? 99% of my photos are taken when I am traveling abroad, and I never found the size or weight of the X-T1 burdensome. I hold it with my left hand - no strap and never dropped it. It's ergonomically and frictionally great. AND the X100S is not that much smaller. Both will look weird if you put them in your pockets.