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Fujifilm XF 16mm F1.4 R WR vs. Fujifilm XF 23mm F1.4 R LM WR

Pick the 16mm f/1.4 if you want a wider field of view, pick the 23mm f/1.4 if you want about 44% more background blur. Compare both side by side.

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

Optical & Portrait Metric Fujifilm XF 16mm F1.4 R WR Fujifilm XF 23mm F1.4 R LM WR What It Means in Practice
Upper-Body Working Distance 1.01 m 1.42 m The Fujifilm XF 23mm F1.4 R LM WR requires 0.4 m more room behind you for the same subject size.
Background Field of View (Compression) 73° 56° Fujifilm XF 23mm F1.4 R LM WR shows a 23% narrower slice of the room behind the subject (56° vs. 73°), isolating them against a cleaner background.
Entrance Pupil Diameter 11.4 mm (f/1.4) 16.4 mm (f/1.4) Distant background blur discs are 44% larger on the Fujifilm XF 23mm F1.4 R LM WR.
Corner Bokeh Roundness (90% Field) 28% (-2.3 EV) 75% (-0.8 EV) Fujifilm XF 23mm F1.4 R LM WR keeps significantly rounder bokeh balls into the corners wide open (75% vs. 28% roundness).
Effective Focal Length (Breathing) 16.0 mm (-0.2%) 22.3 mm (-3.0%) Fujifilm XF 16mm F1.4 R WR frames like 16.0 mm (-0.2%) at 1.0 m; Fujifilm XF 23mm F1.4 R LM WR frames like 22.3 mm (-3.0%) at 1.4 m.
Depth of Field (Sharp Zone) 33 cm (87 cm – 1.20 m) 32 cm (1.28 m – 1.60 m) The Fujifilm XF 23mm F1.4 R LM WR has a 4% thinner focus zone (33 cm vs. 32 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.15 m 0.19 m Fujifilm XF 16mm F1.4 R WR focuses 4 cm closer (0.15 m vs. 0.19 m) for tighter close-ups.

Questions

Which blurs the background more, Fujifilm XF 16mm F1.4 R WR or Fujifilm XF 23mm F1.4 R LM WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 16mm F1.4 R WR at f/1.4 has a 11.4 mm entrance pupil, while Fujifilm XF 23mm F1.4 R LM WR at f/1.4 has a 16.4 mm entrance pupil.

How does working distance differ between Fujifilm XF 16mm F1.4 R WR and Fujifilm XF 23mm F1.4 R LM WR?

For an upper-body portrait, Fujifilm XF 16mm F1.4 R WR stands 1.01 m from the subject (sharp zone 33 cm, from 87 cm to 1.20 m), whereas Fujifilm XF 23mm F1.4 R LM WR stands 1.42 m away (sharp zone 32 cm, from 1.28 m to 1.60 m).

How do the optical designs of Fujifilm XF 16mm F1.4 R WR and Fujifilm XF 23mm F1.4 R LM WR compare?

Fujifilm XF 16mm F1.4 R WR uses 13 elements in 11 groups (US20160282590A1, effective focal length 16.0 mm at portrait distance). Fujifilm XF 23mm F1.4 R LM WR uses 15 elements in 10 groups (US20220276464A1, effective focal length 22.3 mm).

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