Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 PRO on Olympus OM-D E-M5 vs Sigma 17-50mm F2.8 EX DC OS HSM Canon on Canon EOS 70D vs Canon EF-S 17-55mm f/2.8 IS USM on Canon EOS 70D

COMPARISON SELECTION (3 selected items max.)

DxOMark Score

Best at f=12mm & f/2.8 [?]
19

Lens Metric Scores

Sharpness [?]
9 P-Mpix
Transmission [?]
3.4 TStop
Distortion [?]
1.3 %
Vignetting [?]
-0.9 EV
Chr. aberration [?]
10 µm

DxOMark Score

Best at f=21mm & f/2.8 [?]
17

Lens Metric Scores

Sharpness [?]
10 P-Mpix
Transmission [?]
3.3 TStop
Distortion [?]
0.3 %
Vignetting [?]
-0.7 EV
Chr. aberration [?]
11 µm

DxOMark Score

Best at f=35mm & f/2.8 [?]
16

Lens Metric Scores

Sharpness [?]
11 P-Mpix
Transmission [?]
3.6 TStop
Distortion [?]
0.4 %
Vignetting [?]
-1.2 EV
Chr. aberration [?]
6 µm