Canon
RF 10-20mm F4 L IS USM
Canon RF Mount
RF 10-20mm F4 L IS USM — 10–20mm f/4 for Canon RF, a popular choice in the canon lineup.
$2,299
Launch priceReleased Oct 2023
Sony
FE 24-70mm F2.8 GM II
Sony E Mount
The ultimate standard zoom — incredibly sharp, exceptionally compact, and built for professionals.
$2,299
Launch priceReleased Apr 2022
RF 10-20mm F4 L IS USM is 1.5 years newer.
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Wins
RF 10-20mm F4 L IS USM
Wins
FE 24-70mm F2.8 GM II
Which would you choose?
TL;DR — Key differences
- ARF 10-20mm F4 L IS USM has higher OIS effectiveness (5.5 stops vs 0 stops)
- BFE 24-70mm F2.8 GM II has higher Max magnification (0.32 × vs 0.17 ×)
- BFE 24-70mm F2.8 GM II has lower Max aperture (Wide) (f/2.8 vs f/4)
- BFE 24-70mm F2.8 GM II has lower Max aperture (Tele) (f/2.8 vs f/4)
- BFE 24-70mm F2.8 GM II has lower Min focus distance (21 cm vs 24 cm)
Key specs at a glance
Size and weight, to scale
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RF 10-20mm F4 L IS USM
⌀84 × 113 mm
620 g (1.37 lb / 21.87 oz)
Credit card
85.6 × 54 mm
for scale
FE 24-70mm F2.8 GM II
⌀88 × 120 mm
695 g (1.53 lb / 24.52 oz)
RF 10-20mm F4 L IS USM is 7mm shorter and 4mm narrower than FE 24-70mm F2.8 GM II.
RF 10-20mm F4 L IS USM is 75 g lighter than FE 24-70mm F2.8 GM II.
Diameter (⌀) is the maximum barrel width; length is measured from the mount to the front of the lens.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose the RF 10-20mm F4 L IS USM
- ✓
Special elements
Adds 2 UD, 1 Aspherical, 1 Super UD
- ✓
OIS effectiveness
5.5 stops vs 0 stops — higher is better
- ✓
Optical stabilization
Only RF 10-20mm F4 L IS USM supports it
- ✓
Weight
620 g vs 695 g — lower is better
- ✓
Length
112.8 mm vs 120 mm — lower is better
- ✓
Diameter
83.6 mm vs 88 mm — lower is better
Reasons to choose the FE 24-70mm F2.8 GM II
- ✓
Special elements
Adds 2 XA (extreme aspherical), 3 Aspherical, 2 ED…
- ✓
Max aperture (Wide)
f/2.8 vs f/4 — lower is better
- ✓
Max aperture (Tele)
f/2.8 vs f/4 — lower is better
- ✓
Max magnification
0.32 × vs 0.17 × — higher is better
- ✓
Min focus distance
21 cm vs 24 cm — lower is better
Shared specifications
Internal focus
Both support internal focus
Weather sealing
Both support weather sealing
Control ring
Both support control ring
Custom function button
Both support custom function button
Pros & cons at a glance
Editorially curated highlights and trade-offs.
RF 10-20mm F4 L IS USM
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Built-in optical image stabilization
- ✓Weather-sealed construction for outdoor shooting
Cons
- –Premium price point
- –Slower maximum aperture limits low-light performance
FE 24-70mm F2.8 GM II
Pros
- ✓Outstanding sharpness across the entire zoom range
- ✓Remarkably small and lightweight for an f/2.8 zoom
- ✓Four XD Linear focus motors provide blazing-fast AF tracking
- ✓Excellent close-up magnification
- ✓De-clickable aperture ring and customized function buttons
Cons
- –No built-in optical image stabilization (relies on body IBIS)
- –High launch price
- –Aperture ring can be easily bumped if not locked
Decided which one is right for you?
Compare live prices for the RF 10-20mm F4 L IS USM and FE 24-70mm F2.8 GM II at major authorized retailers.
Canon RF 10-20mm F4 L IS USM
Sony FE 24-70mm F2.8 GM II
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.