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Sony FE 50mm f/1.4 GM — GM Series · Compact · Aperture ring
Sony

Sony FE 50mm f/1.4 GM

GM Series · Compact · Aperture ring

96
/ 100
From $1,298
VS
Sony FE 50mm f/1.4 GM wins by 11
Tamron 20-40mm f/2.8 Di III VXD — Prime/zoom
Tamron

Tamron 20-40mm f/2.8 Di III VXD

Prime/zoom

85
/ 100
From $699
Specdex verdict

Sony FE 50mm f/1.4 GM takes it — here’s why.

In our weighted Specdex score, Sony FE 50mm f/1.4 GM lands at 96 and Tamron 20-40mm f/2.8 Di III VXD at 85. That puts Sony FE 50mm f/1.4 GM ahead by 11 points — a decisive margin driven mostly by its strengths in the categories below.

Pick Sony FE 50mm f/1.4 GM if…

  • ✓Best 50mm AF lens for Sony E-mount
  • ✓Compact for f/1.4 GM glass
  • ✓Click-able aperture ring

Pick Tamron 20-40mm f/2.8 Di III VXD if…

  • ✓Proven optical formula
  • ✓Weather-sealing (L/GM/S)
  • ✓Strong resale
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Build

Sony FE 50mm f/1.4 GM

Compared on the build sub-score

Sony FE 50mm f/1.4 GM leads on build (96 vs 90).

Sharpness

Sony FE 50mm f/1.4 GM

Compared on the sharpness sub-score

Sony FE 50mm f/1.4 GM leads on sharpness (98 vs 85).

Autofocus

Sony FE 50mm f/1.4 GM

Compared on the autofocus sub-score

Sony FE 50mm f/1.4 GM leads on af (98 vs 81).

Value for money

Tamron 20-40mm f/2.8 Di III VXD

Specdex score per dollar at MSRP

Tamron 20-40mm f/2.8 Di III VXD more score per dollar ($699 vs $1,298).

Sony FE 50mm f/1.4 GM 96
vs
85 Tamron 20-40mm f/2.8 Di III VXD

Score breakdown

Sony FE 50mm f/1.4 GM
96
sharpness 98
af 98
build 96
bokeh 96
value 84
Tamron 20-40mm f/2.8 Di III VXD
85
sharpness 85
af 81
build 90
bokeh 0
value 86

Specs side-by-side

Sony FE 50mm f/1.4 GM versus Tamron 20-40mm f/2.8 Di III VXD — full spec comparison
Spec Sony FE 50mm f/1.4 GM Tamron 20-40mm f/2.8 Di III VXD
Mount
Sony E
—
Focal length
50 mm
—
Aperture
f/1.4 to f/16
—
Construction
14 elements / 11 groups
—
Min focus
0.41 m
—
Filter
67 mm
—
Weight
516 g
—

Sony FE 50mm f/1.4 GM

Pros
  • +Best 50mm AF lens for Sony E-mount
  • +Compact for f/1.4 GM glass
  • +Click-able aperture ring
Cons
  • −Premium pricing
  • −No image stabilization (relies on IBIS)
  • −No filter included

Tamron 20-40mm f/2.8 Di III VXD

Pros
  • +Proven optical formula
  • +Weather-sealing (L/GM/S)
  • +Strong resale
Cons
  • −Mount-specific
  • −Older AF motor on some
  • −Heavier than modern counterparts

FAQ: Sony FE 50mm f/1.4 GM vs Tamron 20-40mm f/2.8 Di III VXD

Which is better, Sony FE 50mm f/1.4 GM or Tamron 20-40mm f/2.8 Di III VXD? +

Sony FE 50mm f/1.4 GM scores 96 on our weighted rubric — ahead by 11. Your best pick depends on the sub-scores above.

Is Sony FE 50mm f/1.4 GM worth the price? +

At $1,298, Sony FE 50mm f/1.4 GM delivers a Specdex score of 96 — strongest in sharpness.

Is Tamron 20-40mm f/2.8 Di III VXD worth the price? +

At $699, Tamron 20-40mm f/2.8 Di III VXD delivers a Specdex score of 85 — strongest in build.

Does Sony FE 50mm f/1.4 GM or Tamron 20-40mm f/2.8 Di III VXD last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for build, Sony FE 50mm f/1.4 GM or Tamron 20-40mm f/2.8 Di III VXD? +

Sony FE 50mm f/1.4 GM — leads on build (96 vs 90). Compared on the build sub-score.

Which is better for sharpness, Sony FE 50mm f/1.4 GM or Tamron 20-40mm f/2.8 Di III VXD? +

Sony FE 50mm f/1.4 GM — leads on sharpness (98 vs 85). Compared on the sharpness sub-score.