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Fujifilm XF 23mm F2 R WR vs. Fujifilm XF 27mm F2.8 R WR

Pick the 23mm f/2 if you want about 19% more background blur, pick the 27mm f/2.8 if you want less background blur. Compare both side by side.

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

Optical & Portrait Metric Fujifilm XF 23mm F2 R WR Fujifilm XF 27mm F2.8 R WR What It Means in Practice
Upper-Body Working Distance 1.42 m 1.67 m The Fujifilm XF 27mm F2.8 R WR requires 0.2 m more room behind you for the same subject size.
Background Field of View (Compression) 55° 47° Fujifilm XF 27mm F2.8 R WR shows a 15% narrower slice of the room behind the subject (47° vs. 55°), isolating them against a cleaner background.
Entrance Pupil Diameter 11.5 mm (f/2) 9.6 mm (f/2.8) Distant background blur discs are 20% larger on the Fujifilm XF 23mm F2 R WR.
Corner Bokeh Roundness (90% Field) 91% (-0.4 EV) 83% (-0.4 EV) Fujifilm XF 23mm F2 R WR keeps significantly rounder bokeh balls into the corners wide open (91% vs. 83% roundness).
Effective Focal Length (Breathing) 22.8 mm (-0.8%) 27.1 mm (+0.2%) Fujifilm XF 23mm F2 R WR frames like 22.8 mm (-0.8%) at 1.4 m; Fujifilm XF 27mm F2.8 R WR frames like 27.1 mm (+0.2%) at 1.7 m.
Depth of Field (Sharp Zone) 46 cm (1.23 m – 1.69 m) 64 cm (1.41 m – 2.04 m) The Fujifilm XF 23mm F2 R WR has a 29% thinner focus zone (46 cm vs. 64 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.22 m 0.34 m Fujifilm XF 23mm F2 R WR focuses 12 cm closer (0.22 m vs. 0.34 m) for tighter close-ups.

Questions

Which blurs the background more, Fujifilm XF 23mm F2 R WR or Fujifilm XF 27mm F2.8 R WR?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Fujifilm XF 23mm F2 R WR at f/2 has a 11.5 mm entrance pupil, while Fujifilm XF 27mm F2.8 R WR at f/2.8 has a 9.6 mm entrance pupil.

How does working distance differ between Fujifilm XF 23mm F2 R WR and Fujifilm XF 27mm F2.8 R WR?

For an upper-body portrait, Fujifilm XF 23mm F2 R WR stands 1.42 m from the subject (sharp zone 46 cm, from 1.23 m to 1.69 m), whereas Fujifilm XF 27mm F2.8 R WR stands 1.67 m away (sharp zone 64 cm, from 1.41 m to 2.04 m).

How do the optical designs of Fujifilm XF 23mm F2 R WR and Fujifilm XF 27mm F2.8 R WR compare?

Fujifilm XF 23mm F2 R WR uses 10 elements in 6 groups (US20170351051A1, effective focal length 22.8 mm at portrait distance). Fujifilm XF 27mm F2.8 R WR uses 7 elements in 5 groups (US20160011404A1, effective focal length 27.1 mm).

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