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Fujifilm XF 18mm F1.4 R LM WR vs. Fujifilm XF 18mm F2 R

Pick the 18mm f/1.4 if you want about 43% more background blur, pick the 18mm f/2 if you want a wider field of view. Compare both side by side.

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

Optical & Portrait Metric Fujifilm XF 18mm F1.4 R LM WR Fujifilm XF 18mm F2 R What It Means in Practice
Upper-Body Working Distance 1.13 m 1.13 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Background Field of View (Compression) 66° 68° Fujifilm XF 18mm F1.4 R LM WR shows a 3% narrower slice of the room behind the subject (66° vs. 68°), isolating them against a cleaner background.
Entrance Pupil Diameter 12.9 mm (f/1.4) 9.0 mm (f/2) Distant background blur discs are 43% larger on the Fujifilm XF 18mm F1.4 R LM WR.
Corner Bokeh Roundness (90% Field) 80% (-0.7 EV) 81% (-0.7 EV) Similar corner bokeh shape wide open (80% vs. 81% roundness at 90% field).
Effective Focal Length (Breathing) 18.0 mm (+0.3%) 17.4 mm (-3.2%) At 1.1 m, Fujifilm XF 18mm F1.4 R LM WR frames like a 18.0 mm lens while Fujifilm XF 18mm F2 R frames like a 17.4 mm lens.
Depth of Field (Sharp Zone) 32 cm (99 cm – 1.31 m) 47 cm (94 cm – 1.41 m) The Fujifilm XF 18mm F1.4 R LM WR has a 31% thinner focus zone (32 cm vs. 47 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.2 m 0.18 m Fujifilm XF 18mm F2 R focuses 2 cm closer (0.2 m vs. 0.18 m) for tighter close-ups.

Questions

Which blurs the background more, Fujifilm XF 18mm F1.4 R LM WR or Fujifilm XF 18mm F2 R?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 18mm F1.4 R LM WR at f/1.4 has a 12.9 mm entrance pupil, while Fujifilm XF 18mm F2 R at f/2 has a 9.0 mm entrance pupil.

How does working distance differ between Fujifilm XF 18mm F1.4 R LM WR and Fujifilm XF 18mm F2 R?

For an upper-body portrait, Fujifilm XF 18mm F1.4 R LM WR stands 1.13 m from the subject (sharp zone 32 cm, from 99 cm to 1.31 m), whereas Fujifilm XF 18mm F2 R stands 1.13 m away (sharp zone 47 cm, from 94 cm to 1.41 m).

How do the optical designs of Fujifilm XF 18mm F1.4 R LM WR and Fujifilm XF 18mm F2 R compare?

Fujifilm XF 18mm F1.4 R LM WR uses 15 elements in 9 groups (US20220011542A1, effective focal length 18.0 mm at portrait distance). Fujifilm XF 18mm F2 R uses 8 elements in 7 groups (US20140240851A1, effective focal length 17.4 mm).

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