Sigma 17-50mm F2.8 EX DC HSM Pentax on Pentax K-3 vs Sigma 18-35mm F1.8 DC HSM A Nikon on Nikon D3300 vs Sony FE 28-70mm F3.5-5.6 OSS on Sony A7R

COMPARISON SELECTION (3 selected items max.)
Sigma 17-50mm F2.8 EX DC HSM Pentax
Sigma 17-50mm F2.8 EX DC HSM Pentax

DXOMARK Score
Best at f=50mm & f/2.8 [?]
21

Lens Metric Scores

Sharpness [?]
13 P-Mpix
Transmission [?]
3.1 TStop
Distortion [?]
0.3 %
Vignetting [?]
-1 EV
Chr. aberration [?]
9 µm
Sigma 18-35mm F1.8 DC HSM A Nikon
Sigma 18-35mm F1.8 DC HSM A Nikon

DXOMARK Score
Best at f=18mm & f/1.8 [?]
30

Lens Metric Scores

Sharpness [?]
17 P-Mpix
Transmission [?]
2 TStop
Distortion [?]
0.4 %
Vignetting [?]
-1.2 EV
Chr. aberration [?]
8 µm
Sony FE 28-70mm F3.5-5.6 OSS
Sony FE 28-70mm F3.5-5.6 OSS

DXOMARK Score
Best at f=28mm & f/3.5 [?]
22

Lens Metric Scores

Sharpness [?]
16 P-Mpix
Transmission [?]
4.9 TStop
Distortion [?]
0.8 %
Vignetting [?]
-1.5 EV
Chr. aberration [?]
10 µm