Get Zeiss Otus at B&H Photo.
This aperture series from f/1.4 through f/8 with the Zeiss Otus 100mm f/1.4 APO-Sonnar looks at sharpness across the field as the sum total of optical performance, field curvature, focus shift and lens symmetry.
This planar target is highly demanding for any lens, intolerant of focus shift and field curvature, mercilessly revealing any lens weakness. Few lenses can deliver full sharpness on this scene wide open or even with stopping down, even very expensive ones.
Includes images up to full camera resolution, plus crops.
This might be the finest performance on this subject that I have ever seen.