Comparison of Canon EF 20mm f/2.8 USM and Zeiss 21mm f/2.8 Loxia 2.8/21

Attribute	Canon EF 20mm f/2.8 USM ×	Zeiss 21mm f/2.8 Loxia 2.8/21 ×
Filter Size (mm)	72	52
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.25	0.25
Magnification Ratio (x)	0.14	0.13
Type	Wide Prime	Wide Prime
Focus Details	Inner focusing; full-time manual focus and USM	Manual focus only, with large 180 degree focus throw, engraved distance and DOF scales
APS Equivalent	32mm	1.5x: 31.5mm
Notes	-	Sony E-Mount (full frame); Weather-resistant lens mount gasket; Included Accessories: Lens hood, front and rear lens caps, de-click key.
Image Circle	35mm	35mm
Focal Length (mm)	20.00	21.00
Brand	Canon	Carl-zeiss
Name	Canon EF 20mm f/2.8 USM	Zeiss 21mm f/2.8 Loxia 2.8/21
Weight (g)	405	394
Diagonal Angle of View (degree)	94.00	91.00
Diaphragm Blades	6	10
Diameter (mm)	71	62.1
Length (mm)	77	85
Diaphragm Blades Type	-	rounded
Lens Construction	11 elements in 9 groups	11 elements in 9 groups, including 1 aspherical and 4 anomalous partial dispersion elements; Zeiss T* anti-reflective coating