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Sony FE 24mm F1.4 GM vs. Sony FE 24mm F2.8 G

Pick the 24mm f/1.4 if you want about 100% more background blur, pick the 24mm f/2.8 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 Sony FE 24mm F1.4 GM Sony FE 24mm F2.8 G What It Means in Practice
Upper-Body Working Distance 0.99 m 0.99 m Identical working distance—both frame an upper-body portrait from the exact same spot.
Background Field of View (Compression) 73° 75° Sony FE 24mm F1.4 GM shows a 3% narrower slice of the room behind the subject (73° vs. 75°), isolating them against a cleaner background.
Entrance Pupil Diameter 17.1 mm (f/1.4) 8.6 mm (f/2.8) Distant background blur discs are 99% larger on the Sony FE 24mm F1.4 GM.
Corner Bokeh Roundness (90% Field) 79% (-0.8 EV) 44% (-4.2 EV) Sony FE 24mm F1.4 GM keeps significantly rounder bokeh balls into the corners wide open (79% vs. 44% roundness).
Effective Focal Length (Breathing) 24.2 mm (+0.6%) 23.6 mm (-1.7%) At 1.0 m, Sony FE 24mm F1.4 GM frames like a 24.2 mm lens while Sony FE 24mm F2.8 G frames like a 23.6 mm lens.
Depth of Field (Sharp Zone) 21 cm (90 cm – 1.11 m) 44 cm (82 cm – 1.25 m) The Sony FE 24mm F1.4 GM has a 52% thinner focus zone (21 cm vs. 44 cm)—requiring more precise eye focus.
Minimum Focus Distance 0.24 m 0.24 m Both lenses share the same 0.24 m close-focus limit.

Questions

Which blurs the background more, Sony FE 24mm F1.4 GM or Sony FE 24mm F2.8 G?

At the same subject framing, distant background blur scales with the entrance pupil diameter (focal length ÷ f-number). Sony FE 24mm F1.4 GM at f/1.4 has a 17.1 mm entrance pupil, while Sony FE 24mm F2.8 G at f/2.8 has a 8.6 mm entrance pupil.

How does working distance differ between Sony FE 24mm F1.4 GM and Sony FE 24mm F2.8 G?

For an upper-body portrait, Sony FE 24mm F1.4 GM stands 0.99 m from the subject (sharp zone 21 cm, from 90 cm to 1.11 m), whereas Sony FE 24mm F2.8 G stands 0.99 m away (sharp zone 44 cm, from 82 cm to 1.25 m).

How do the optical designs of Sony FE 24mm F1.4 GM and Sony FE 24mm F2.8 G compare?

Sony FE 24mm F1.4 GM uses 13 elements in 10 groups (WO2019073744A1, effective focal length 24.2 mm at portrait distance). Sony FE 24mm F2.8 G uses 10 elements in 7 groups (JP2022-030896A, effective focal length 23.6 mm).

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