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Leica Super-APO-Summicron-SL 21mm f/2 ASPH vs Sigma 20mm f/2 DG Contemporary

The Leica Super-APO-Summicron-SL 21mm f/2 ASPH and the Sigma 20mm f/2 DG Contemporary side by side, computed from this guide's catalogue.

Which to pick

Pick the Sigma 20mm f/2 DG Contemporary if you want a fit on more cameras (66 against 25 in this guide) and a lighter lens (370 g against 789 g). On these specs the Leica Super-APO-Summicron-SL 21mm f/2 ASPH has no clear advantage: choose it if the price, the handling or a lens you own decides it.

Still torn? Ask the guide about the Leica Super-APO-Summicron-SL 21mm f/2 ASPH and the Sigma 20mm f/2 DG Contemporary

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Leica Super-APO-Summicron-SL 21mm f/2 ASPH	Sigma 20mm f/2 DG Contemporary
Maker	Leica	Sigma
Focal length	21mm (prime)	20mm (prime)
Full-frame equivalent	21mm	20mm
Maximum aperture	f/2	f/2
Made for	Full frame	Full frame
Mounts	L-Mount	Sony E, L-Mount
Stabilised	no	no
Autofocus	yes	yes
Weight	789 g	370 glighter
Cameras it fits	25 in this guide	66 in this guidefits more cameras

Focal range, in full-frame terms

Leica Super-APO-Summicron-SL 21mm f/2 ASPH: 21mm.

Sigma 20mm f/2 DG Contemporary: 20mm.

Aperture

Leica Super-APO-Summicron-SL 21mm f/2 ASPH: f/2 wide open.

Sigma 20mm f/2 DG Contemporary: f/2 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

25 cameras in this guide take both, so either works on the same body. In all, the Leica Super-APO-Summicron-SL 21mm f/2 ASPH fits 25 and the Sigma 20mm f/2 DG Contemporary 66.