Fujifilm X-S1 Samples

Below are sample crops from an indoor photograph at each of the Fuji Finepix X-S1's ISO settings. A crop from the Fujifilm Finepix S100FS
Fujifilm Finepix S100FS at the same ISO setting is shown next to each one of the Fuji X-S1. Images below are all unmodified 100% crops from their respective cameras taken at the highest quality setting. Aperture, ISO and white-balance were set on camera, everything else was left on automatic.

These crops help determine which ISO settings can be acceptably used. As noise increases, digital cameras usually compensate with noise reduction which introduces softness. The result is that, while you can partly reduce noise at the expense of details, the maximum acceptable print size gets smaller as ISO is increased. The point at which a print become unacceptably noisy is a matter of personal taste.

Fuji Finepix X-S1	Fuji Finepix S100FS
ISO 100	ISO 100
ISO 200	ISO 200
ISO 400	ISO 400
ISO 800	ISO 800
ISO 1600	ISO 1600
ISO 3200	ISO 3200
ISO 6400 (6 MP)	ISO 6400 (6 MP)
ISO 12800 (3 MP)	ISO 10000 (3 MP)
While both cameras deliver great results for their category, the S100FS starts with a small but noticeable lead at low ISO sensitivities. By ISO 800 though, results are evenly matched and the X-S1 then overtakes it predecessor at the highest sensitivities.