The following pairs of images consist of a reduced size full image, and a crop taken at full resolution.

/85574b|12c1_1490-100reduced.jpg
/6bb26b|cde1_1490-100crop.jpg
There’s no noticeable image noise at this minimum setting, but there is still evidence of noise reduction, which reduces fine detail.

/209238|265a_1490-200reduced.jpg
/c62367|26ec_1490-200crop.jpg
There is colour noise in the shadow areas of this image, despite the heavy-handed noise reduction that has left the image looking like it was painted with a brush.

/cc02d4|9f7b_1490-400reduced.jpg
/e5a70e|18b2_1490-400crop.jpg
Look at the shadows under the bushes: colour noise everywhere. Also, look at the water at the foot of the weir, which has no fine detail.