Sharpness at 15mm

For this test, the Sony E 15mm F1.4 G lens was attached to a Sony ZV-E10 body, which was in turn mounted to a sturdy tripod. Exposure delay mode was activated. Tonal and colour variance across the crops are due to change in natural light during the session.

The full frame at 15mm

The centre is a little soft when shooting wide open at f/1.4, with peak performance achieved in the f/2-f/11 range. Diffraction sets in at f/16.

The edges are not as sharp as the centre, with f/2.8 to f/11 the optimum settings.

Aperture	Centre Crop	Edge Crop
f/1.4
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16