Canon RF 50mm f/1.2 L vs Sony FE 50mm f/1.2 GM

Portrait At-a-Glance Comparison (Upper Body Framing)

Optical & Portrait Metric	Canon RF 50mm F1.2 L USM	Sony FE 50mm F1.2 GM	What It Means in Practice
Upper-Body Working Distance	2.01 m	2.01 m	Identical working distance—both frame an upper-body portrait from the exact same spot.
Background Field of View (Compression)	39°	39°	Identical 39° horizontal background view behind the subject.
Entrance Pupil Diameter	41.7 mm (f/1.2)	41.7 mm (f/1.2)	Nearly identical distant background blur size at equal framing.
Corner Bokeh Roundness (90% Field)	41% (-1.5 EV)	43% (-1.3 EV)	Similar corner bokeh shape wide open (41% vs. 43% roundness at 90% field).
Effective Focal Length (Breathing)	50.8 mm (+1.6%)	50.7 mm (+1.5%)	At 2.0 m, Canon RF 50mm F1.2 L USM frames like a 50.8 mm lens while Sony FE 50mm F1.2 GM frames like a 50.7 mm lens.
Depth of Field (Sharp Zone)	17 cm (1.93 m – 2.10 m)	17 cm (1.93 m – 2.10 m)	Both lenses deliver the exact same 17 cm sharp focus zone.
Minimum Focus Distance	0.4 m	0.4 m	Both lenses share the same 0.4 m close-focus limit.

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Questions

Which blurs the background more, Canon RF 50mm F1.2 L USM or Sony FE 50mm F1.2 GM?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon RF 50mm F1.2 L USM at f/1.2 has a 41.7 mm entrance pupil, while Sony FE 50mm F1.2 GM at f/1.2 has a 41.7 mm entrance pupil.

How does working distance differ between Canon RF 50mm F1.2 L USM and Sony FE 50mm F1.2 GM?

For an upper-body portrait, Canon RF 50mm F1.2 L USM stands 2.01 m from the subject (sharp zone 17 cm, from 1.93 m to 2.10 m), whereas Sony FE 50mm F1.2 GM stands 2.01 m away (sharp zone 17 cm, from 1.93 m to 2.10 m).

How do the optical designs of Canon RF 50mm F1.2 L USM and Sony FE 50mm F1.2 GM compare?

Canon RF 50mm F1.2 L USM uses 15 elements in 9 groups (US20190265441A1, effective focal length 50.8 mm at portrait distance). Sony FE 50mm F1.2 GM uses 12 elements in 9 groups (WO2017138250A1, effective focal length 50.7 mm).

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Also see: depth of field, bokeh, crop factor, lens compression.