Nikon AF-S NIKKOR 20mm f/1.8G ED on Nikon D810 vs Carl Zeiss Loxia 2.8/21 on Sony A7R II vs Sigma 20mm F1.4 DG HSM A Canon on Canon EOS 5DS R

COMPARISON SELECTION (3 selected items max.)
Nikon AF-S NIKKOR 20mm f/1.8G ED
Nikon AF-S NIKKOR 20mm f/1.8G ED

DXOMARK Score
Best at f=20mm & f/1.8 [?]
33

Lens Metric Scores

Sharpness [?]
25 P-Mpix
Transmission [?]
2.1 TStop
Distortion [?]
0.5 %
Vignetting [?]
-1.9 EV
Chr. aberration [?]
7 µm
Carl Zeiss Loxia 2.8/21
Carl Zeiss Loxia 2.8/21

DXOMARK Score
Best at f=21mm & f/2.8 [?]
42

Lens Metric Scores

Sharpness [?]
37 P-Mpix
Transmission [?]
2.8 TStop
Distortion [?]
0.4 %
Vignetting [?]
-2.8 EV
Chr. aberration [?]
7 µm
Sigma 20mm F1.4 DG HSM A Canon
Sigma 20mm F1.4 DG HSM A Canon

DXOMARK Score
Best at f=20mm & f/1.4 [?]
40

Lens Metric Scores

Sharpness [?]
33 P-Mpix
Transmission [?]
1.8 TStop
Distortion [?]
0.8 %
Vignetting [?]
-1.7 EV
Chr. aberration [?]
6 µm