Noise Comparison: Canon 5DS R vs Canon 5D Mark III
Get Canon 5DS and Canon 5DS R at B&H Photo.
Noise should be compared for the same reproduction ratio; per pixel noise is an erroneous way to compare noise, since higher megapixels means less enlargement. Hence this page compares the Canon 5DS R noise to that of the Canon 5D Mark III by downsampling to the 5DM3 resolution.
Canon 5DS R Noise vs Canon 5D Mark III (Fruit)
With full resolution images and crops from ISO 100 through ISO 12800.