Get Canon 5DS DSLR at B&H Photo.
At 50 megapixels, the Canon 5DS R reveals optical imperfections that the 22-megapixel Canon 5D Mark III tends to minimize, the 5DS R having 1.5X greater resolving power over the 5DM3.
Even lenses with well-controlled color fringing (lateral chromatic aberration) may now need correction with the 1.5X greater resolution of the 5DS R vs the Canon 5D Mark III. Presented in my review of the Canon 5DS R:
Includes the uncorrected image along with the image corrected for LACA and LACA + distortion correction. As well as crops.