This aperture series from f/1.4 to f/13 at relatively close distance assesses across-the-frame and near-to-far sharpness, secondary color correction, and focus shift.
Sigma FE 85mm f/1.4 DG DN Art Aperture Series: Mining Hoist
Includes images at up to full camera resolution from f/1.4 through f/13 with crops. Shot in pixel shift mode for maximal detail.
The about $1199 Sigma FE 85mm f/1.4 DG DN Art offers very high performance, but it has some behaviors worth knowing about for optimal results.
f4.5 @ 1/40 sec electronic shutter pixel shift, ISO 100; 2020-11-16 17:22:14[low-res image for bot]
Sony A7R IV + Sigma FE 85mm f/1.4 DG DN Art
ENV: just north of Death Valley, altitude 5160 ft / 1573 m, 60°F / 15°C
RAW: LACA corrected, +30 Shadows, +30 Whites, +15 Clarity