test results have been added to the Sony a7R IV
This camera's 61 MP resolution is quite impressive.
Here is the Sony a7R IV vs. III comparison
Canon's highest resolution imaging sensor is in the EOS 5Ds
Here is the Sony a7R IV vs. Canon EOS 5Ds R comparison
Nikon's highest resolution imaging sensor is in the D850
and Z 7
Here is the Sony a7R IV vs. Nikon Z 7 comparison
Note that different lenses were used in this comparison test.
Higher pixel density on the imaging sensor means that the softening effects of diffraction start becoming noticeable at the pixel level — not in equal output sizes — at wider apertures than with lower resolution imaging sensors.
Here is an f/11 vs. f/8 comparison
The Sony a7R IV
is in stock at B&H
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Rent the Sony a7R IV