I use both of these cameras. The GR is the best pocket digital I've ever owned. Yes, it fits in your front pants pocket. I don't wear baggy pants either. The lens is great, but the high ISO is a notch or two below the X100s. For a camera that does not have a dedicated shutter speed dial and aperture ring, the GR does have a clean and easy to use modern interface. That said, I feel the X100s is the better overall and more versatile camera. Its built in O/EVF finder, its dedicated knobs and rings, its better high ISO and faster lens, traditional body style feels more like a camera, etc. You cannot go wrong with either. Choose based on your priorities. 28mm vs. 35mm, no VF vs. VF, pocketable vs. not pocketable, old school ergonomics vs. new school ergonomics, etc.