All frames were shot on the 42-megapixel Sony A7R III in pixel shift mode for maximum quality—with pixel shift, even subtle differences in imaging quality pop out, and diffraction is even more of a factor at f/11 than without pixel shift.
The subject matter is a planar target that gives many lenses (well, most) at best a passing grade, but rarely an 'A'. It is a very difficult challenge for a lens because it not only mercilessly reveals any symmetry issues, but the target is also planar (flat), so field curvature can wreak havoc with mid/edge/corner sharpness.
Includes images from f/2.4 (f/4) through f/11 at up to full camera resolution, with commentary and large crops.
The results here should leave no doubt why I prefer shooting primes on Sony, particularly the Zeiss Loxia series.
The image is off-level but the A7R III claimed it was level. Measuring in Photoshop shows that it is off only 0.8°. Cameras of all brands generally have very poor leveling indicators with ±1% accuracy at best—not good at all.