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Canon RF 50mm F1.2 L USM vs. Fujifilm GF 80mm F1.7 R WR

Pick the 50mm f/1.2 if you want a wider field of view, pick the 80mm f/1.7 if you want about 13% more background blur. Compare both side by side.

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

Optical & Portrait Metric Canon RF 50mm F1.2 L USM Fujifilm GF 80mm F1.7 R WR What It Means in Practice
Upper-Body Working Distance 2.01 m 2.64 m The Fujifilm GF 80mm F1.7 R WR requires 0.6 m more room behind you for the same subject size.
Background Field of View (Compression) 39° 30° Fujifilm GF 80mm F1.7 R WR shows a 23% narrower slice of the room behind the subject (30° vs. 39°), isolating them against a cleaner background.
Entrance Pupil Diameter 41.7 mm (f/1.2) 47.1 mm (f/1.7) Distant background blur discs are 13% larger on the Fujifilm GF 80mm F1.7 R WR.
Corner Bokeh Roundness (90% Field) 41% (-1.5 EV) 46% (-1.3 EV) Fujifilm GF 80mm F1.7 R WR keeps significantly rounder bokeh balls into the corners wide open (46% vs. 41% roundness).
Effective Focal Length (Breathing) 50.8 mm (+1.6%) 82.5 mm (+3.1%) Canon RF 50mm F1.2 L USM frames like 50.8 mm (+1.6%) at 2.0 m; Fujifilm GF 80mm F1.7 R WR frames like 82.5 mm (+3.1%) at 2.6 m.
Depth of Field (Sharp Zone) 17 cm (1.93 m – 2.10 m) 20 cm (2.55 m – 2.74 m) The Canon RF 50mm F1.2 L USM has a 13% thinner focus zone (17 cm vs. 20 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.4 m 0.7 m Canon RF 50mm F1.2 L USM focuses 30 cm closer (0.4 m vs. 0.7 m) for tighter close-ups.

Questions

Which blurs the background more, Canon RF 50mm F1.2 L USM or Fujifilm GF 80mm F1.7 R WR?

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 Fujifilm GF 80mm F1.7 R WR at f/1.7 has a 47.1 mm entrance pupil.

How does working distance differ between Canon RF 50mm F1.2 L USM and Fujifilm GF 80mm F1.7 R WR?

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 Fujifilm GF 80mm F1.7 R WR stands 2.64 m away (sharp zone 20 cm, from 2.55 m to 2.74 m).

How do the optical designs of Canon RF 50mm F1.2 L USM and Fujifilm GF 80mm F1.7 R WR compare?

Canon RF 50mm F1.2 L USM uses 15 elements in 9 groups (US20190265441A1, effective focal length 50.8 mm at portrait distance). Fujifilm GF 80mm F1.7 R WR uses 12 elements in 9 groups (US20210294073A1, effective focal length 82.5 mm).

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