Click on an image to view them in slideshow mode for comparisons.
Last evening I made some comparison images at different ISOs. I used the Fujifilm X-T2 and the 35mm F2 lens. I used the program mode to make in-camera jpegs as I only varied the ISO levels. The above images are severe crops so that you can see the results at the pixel level.
The camera settings were:
Image 170628-191013 : ISO 1000, f/2, 1/60 sec.
Image 170628-191041 : ISO 6400, f/2.5, 1/200 sec.
Image 170628-191052 : ISO 12800, f/4, 1/200 sec.
You can see that as the ISO was increased that the image lost a little dynamic range and details; but the settings also show the advantages gained. I can achieve higher shutter rates and greater depth of field when photographing events in poor light where there is significant subject motion. I doubt that my resident viewers will notice the slight degradation of image quality when they are looking at PowerPoint presentations or at in-house printed presentations.