Full ISO 100 image. See the cropped (zoomed to 100%) versions below.
Noise and grain are suppressed impressively well throughout the Canon IXUS 125 HS's sensitivity range.
Only at the highest ISO 3200 setting is colour speckling evident, but is not especially problematic. Detail is slightly smoothed at ISO 1600 and 3200, but not to distracting levels.
The Canon IXUS 125 HS succeeds admirably well in producing great image quality at all ISO settings.