Canon RF 85mm f/1.2 L vs Canon RF 85mm f/1.2 L DS

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

Optical & Portrait Metric	Canon RF 85mm F1.2 L USM	Canon RF 85mm F1.2 L USM DS	What It Means in Practice
Upper-Body Working Distance	3.41 m	3.41 m	Identical working distance—both frame an upper-body portrait from the exact same spot.
Background Field of View (Compression)	23°	23°	Identical 23° horizontal background view behind the subject.
Entrance Pupil Diameter	70.8 mm (f/1.2)	70.8 mm (f/1.2)	Nearly identical distant background blur size at equal framing.
Corner Bokeh Roundness (90% Field)	44% (-1.3 EV)	44% (-1.3 EV)	Similar corner bokeh shape wide open (44% vs. 44% roundness at 90% field).
Effective Focal Length (Breathing)	88.4 mm (+4.0%)	88.4 mm (+4.0%)	At 3.4 m, Canon RF 85mm F1.2 L USM frames like a 88.4 mm lens while Canon RF 85mm F1.2 L USM DS frames like a 88.4 mm lens.
Depth of Field (Sharp Zone)	17 cm (3.33 m – 3.49 m)	17 cm (3.33 m – 3.49 m)	Both lenses deliver the exact same 17 cm sharp focus zone.
Minimum Focus Distance	0.85 m	0.85 m	Both lenses share the same 0.85 m close-focus limit.

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Questions

Which blurs the background more, Canon RF 85mm F1.2 L USM or Canon RF 85mm F1.2 L USM DS?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Canon RF 85mm F1.2 L USM at f/1.2 has a 70.8 mm entrance pupil, while Canon RF 85mm F1.2 L USM DS at f/1.2 has a 70.8 mm entrance pupil.

How does working distance differ between Canon RF 85mm F1.2 L USM and Canon RF 85mm F1.2 L USM DS?

For an upper-body portrait, Canon RF 85mm F1.2 L USM stands 3.41 m from the subject (sharp zone 17 cm, from 3.33 m to 3.49 m), whereas Canon RF 85mm F1.2 L USM DS stands 3.41 m away (sharp zone 17 cm, from 3.33 m to 3.49 m).

How do the optical designs of Canon RF 85mm F1.2 L USM and Canon RF 85mm F1.2 L USM DS compare?

Canon RF 85mm F1.2 L USM uses 14 elements in 9 groups (US20200012073A1, effective focal length 88.4 mm at portrait distance). Canon RF 85mm F1.2 L USM DS uses 14 elements in 9 groups (US20200012073A1, effective focal length 88.4 mm).

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