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Canon RF 50mm f/1.2L USM — Prime/Zoom
Canon

Canon RF 50mm f/1.2L USM

Prime/Zoom

96
/ 100
From $2,299
VS
Canon RF 50mm f/1.2L USM wins by 10
Sigma 100-400mm DG DN OS — Prime/zoom
Sigma

Sigma 100-400mm DG DN OS

Prime/zoom

86
/ 100
From $999
Specdex verdict

Canon RF 50mm f/1.2L USM takes it — here’s why.

In our weighted Specdex score, Canon RF 50mm f/1.2L USM lands at 96 and Sigma 100-400mm DG DN OS at 86. That puts Canon RF 50mm f/1.2L USM ahead by 10 points — a decisive margin driven mostly by its strengths in the categories below.

Pick Canon RF 50mm f/1.2L USM if…

  • ✓Fast autofocus
  • ✓Weather-sealed
  • ✓Premium optics

Pick Sigma 100-400mm DG DN OS 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

Canon RF 50mm f/1.2L USM

Compared on the build sub-score

Canon RF 50mm f/1.2L USM leads on build (94 vs 90).

Sharpness

Canon RF 50mm f/1.2L USM

Compared on the sharpness sub-score

Canon RF 50mm f/1.2L USM leads on sharpness (96 vs 86).

Autofocus

Canon RF 50mm f/1.2L USM

Compared on the autofocus sub-score

Canon RF 50mm f/1.2L USM leads on af (95 vs 82).

Value for money

Sigma 100-400mm DG DN OS

Specdex score per dollar at MSRP

Sigma 100-400mm DG DN OS more score per dollar ($999 vs $2,299).

Canon RF 50mm f/1.2L USM 96
vs
86 Sigma 100-400mm DG DN OS

Score breakdown

Canon RF 50mm f/1.2L USM
96
sharpness 96
af 95
build 94
value 84
Sigma 100-400mm DG DN OS
86
sharpness 86
af 82
build 90
value 86

Specs side-by-side

Canon RF 50mm f/1.2L USM versus Sigma 100-400mm DG DN OS — full spec comparison
Spec Canon RF 50mm f/1.2L USM Sigma 100-400mm DG DN OS

Canon RF 50mm f/1.2L USM

Pros
  • +Fast autofocus
  • +Weather-sealed
  • +Premium optics
Cons
  • −Heavy
  • −Expensive
  • −Focus breathing varies

Sigma 100-400mm DG DN OS

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

FAQ: Canon RF 50mm f/1.2L USM vs Sigma 100-400mm DG DN OS

Which is better, Canon RF 50mm f/1.2L USM or Sigma 100-400mm DG DN OS? +

Canon RF 50mm f/1.2L USM scores 96 on our weighted rubric — ahead by 10. Your best pick depends on the sub-scores above.

Is Canon RF 50mm f/1.2L USM worth the price? +

At $2,299, Canon RF 50mm f/1.2L USM delivers a Specdex score of 96 — strongest in sharpness.

Is Sigma 100-400mm DG DN OS worth the price? +

At $999, Sigma 100-400mm DG DN OS delivers a Specdex score of 86 — strongest in build.

Does Canon RF 50mm f/1.2L USM or Sigma 100-400mm DG DN OS 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, Canon RF 50mm f/1.2L USM or Sigma 100-400mm DG DN OS? +

Canon RF 50mm f/1.2L USM — leads on build (94 vs 90). Compared on the build sub-score.

Which is better for sharpness, Canon RF 50mm f/1.2L USM or Sigma 100-400mm DG DN OS? +

Canon RF 50mm f/1.2L USM — leads on sharpness (96 vs 86). Compared on the sharpness sub-score.