Bokeh is excellent, subjectively on par with the Canon 50mm f/1.2L (but different). By comparison, the Canon EF 50mm f/1.4 has quite harsh-edged bokeh at f/1.4, similar to the Zeiss ZF/ZE 50/1.4 Planar.
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f/1.4: Sigma, Canon 50/1.2L, Canon 50/1.4
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