Sigma
Sigma 100-400mm DG DN OS
Prime/zoom
86
/ 100
From $999
VS
Canon RF 85mm f/1.2L USM wins by 10
Canon
Canon RF 85mm f/1.2L USM
Prime/Zoom
96
/ 100
From $2,699
Specdex verdict
Canon RF 85mm f/1.2L USM takes it — here’s why.
In our weighted Specdex score, Sigma 100-400mm DG DN OS lands at 86 and Canon RF 85mm f/1.2L USM at 96. That puts Canon RF 85mm f/1.2L USM ahead by 10 points — a decisive margin driven mostly by its strengths in the categories below.
Pick Sigma 100-400mm DG DN OS if…
- ✓Proven optical formula
- ✓Weather-sealing (L/GM/S)
- ✓Strong resale
Pick Canon RF 85mm f/1.2L USM if…
- ✓Fast autofocus
- ✓Weather-sealed
- ✓Premium optics
Sigma 100-400mm DG DN OS 86
vs 96 Canon RF 85mm f/1.2L USM
Score breakdown
Sigma 100-400mm DG DN OS
86 sharpness 86
af 82
build 90
value 86
Canon RF 85mm f/1.2L USM
96 sharpness 96
af 95
build 94
value 84
Specs side-by-side
| Spec | Sigma 100-400mm DG DN OS | Canon RF 85mm f/1.2L USM |
|---|
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
Canon RF 85mm f/1.2L USM
Pros
- +Fast autofocus
- +Weather-sealed
- +Premium optics
Cons
- −Heavy
- −Expensive
- −Focus breathing varies
FAQ: Sigma 100-400mm DG DN OS vs Canon RF 85mm f/1.2L USM
Which is better, Sigma 100-400mm DG DN OS or Canon RF 85mm f/1.2L USM? +
Canon RF 85mm f/1.2L USM scores 96 on our weighted rubric — ahead by 10. Your best pick depends on the sub-scores above.
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.
Is Canon RF 85mm f/1.2L USM worth the price? +
At $2,699, Canon RF 85mm f/1.2L USM delivers a Specdex score of 96 — strongest in sharpness.
Does Sigma 100-400mm DG DN OS or Canon RF 85mm f/1.2L USM 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.