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Canon RF 15-35mm f/2.8L IS USM — Prime/Zoom
Canon

Canon RF 15-35mm f/2.8L IS USM

Prime/Zoom

93
/ 100
From $2,299
VS
Sony FE 100-400mm f/4.5-5.6 GM OSS — Prime/Zoom
Sony

Sony FE 100-400mm f/4.5-5.6 GM OSS

Prime/Zoom

93
/ 100
From $2,498
Specdex verdict

Dead heat — it comes down to priorities.

In our weighted Specdex score, Canon RF 15-35mm f/2.8L IS USM lands at 93 and Sony FE 100-400mm f/4.5-5.6 GM OSS at 93. With scores tied, the decision hinges on which sub-scores matter most to you.

Pick Canon RF 15-35mm f/2.8L IS USM if…

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

Pick Sony FE 100-400mm f/4.5-5.6 GM OSS if…

  • ✓Fast autofocus
  • ✓Weather-sealed
  • ✓Premium optics
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Winner by scenario

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

Build

Tie

Compared on the build sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Sharpness

Tie

Compared on the sharpness sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Autofocus

Tie

Compared on the autofocus sub-score

Effectively tied — neither pulls a 2-point weighted lead.

Value for money

Tie

Specdex score per dollar at MSRP

Effectively tied — similar score-per-dollar at MSRP.

Canon RF 15-35mm f/2.8L IS USM 93
vs
93 Sony FE 100-400mm f/4.5-5.6 GM OSS

Score breakdown

Canon RF 15-35mm f/2.8L IS USM
93
sharpness 93
af 92
build 94
value 84
Sony FE 100-400mm f/4.5-5.6 GM OSS
93
sharpness 93
af 92
build 94
value 84

Specs side-by-side

Canon RF 15-35mm f/2.8L IS USM versus Sony FE 100-400mm f/4.5-5.6 GM OSS — full spec comparison
Spec Canon RF 15-35mm f/2.8L IS USM Sony FE 100-400mm f/4.5-5.6 GM OSS

Canon RF 15-35mm f/2.8L IS USM

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

Sony FE 100-400mm f/4.5-5.6 GM OSS

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

FAQ: Canon RF 15-35mm f/2.8L IS USM vs Sony FE 100-400mm f/4.5-5.6 GM OSS

Which is better, Canon RF 15-35mm f/2.8L IS USM or Sony FE 100-400mm f/4.5-5.6 GM OSS? +

Both score 93 on our weighted rubric — tied. Your best pick depends on the sub-scores above.

Is Canon RF 15-35mm f/2.8L IS USM worth the price? +

At $2,299, Canon RF 15-35mm f/2.8L IS USM delivers a Specdex score of 93 — strongest in build.

Is Sony FE 100-400mm f/4.5-5.6 GM OSS worth the price? +

At $2,498, Sony FE 100-400mm f/4.5-5.6 GM OSS delivers a Specdex score of 93 — strongest in build.

Does Canon RF 15-35mm f/2.8L IS USM or Sony FE 100-400mm f/4.5-5.6 GM OSS 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.