the best 24-70mm lens they have tested to date and the fifth-highest-scoring zoom lens in their database
significantly sharper than the Nikkor Z 24-70mm f/4 S but not as sharp as the Canon EF 24-70mm f/2.8L II USM on the 50Mp EOS 5DS R but has much less CA
2.1EV for vignetting but at 24mm and f/4, the Z 24-70mm f/2.8 S creates less corner shading than the Z 24-70mm f/4 S;
noticeable distortion at the extreme ends of focal range but this is corrected in-camera; lowest CA of comparable zooms;
light transmission score of 3 is not as good as the Canon RF 28-70mm f/2L USM and the Sony FE 24-70mm F2.8 GM, which score 2.2 and 2.8, respectively.
sharpest in centre at f/2.8 which is MUCH sharper than wide open, but edges need f/5.6-8 for maximal sharpness at which point centre sharpness has fallen; some mild field curvature; no focus shift when changing aperture; focus breathing compensation built in;
1.8EV vignetting wide open; 1.21% barrel distortion; lat. CA well controlled; some long CA at f/1.8-2.8;
some onion ring bokeh due to ASPH elements; good flare control; produces 18-point starbursts / sunstars in images; some coma at wide apertures;
40mm compact
2020?
50mm f/1.2 S
announced Sept 2020
stepping motors (STM) as well as a multi-focusing system