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20mm F2 for half the price of a Zeiss Loxia one stop slower.
Clicky-clickless aperture switch.
Actual useful Aperture ring at the front and not hidden in the back and hard to use.
Perfect Coma free images wide open.
Sharp from corner to corner wide open.
EXIF for distortion correction data and focal length data for sensor's image stabilizer.
Compact and small for its aperture.
Why are you not hyped for the perfect wideangle lens?