Zeiss CONTAX Distagon 21mm f/2.8
Arguably one of the very best 135 full frame, wide angle lenses ever made and now quite rare. Just listed on the 'bay in Japan at US$1000
https://www.ebay.com.au/itm/362229936543?ul_noapp=true
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I use one via the original Metabones CY>E Speed Booster on a Sony S35 video camera and the results are superb. It offers a 90 degree Field of View, zero barrel distortion, massive depth of field from virtually the glass to infinity (stopped a bit) and about f/1.9 at the sensor, wide open.