Canon
RF 85mm F1.2L USM
Canon RF Mount
The definitive portrait prime for RF — f/1.2 aperture delivers unmatched subject separation and dreamy backgrounds.
$2,699
Launch priceReleased Feb 2019
Sony
FE 300mm F2.8 GM OSS
Sony E Mount
World's lightest 300mm F2.8 — 1470g with XD Linear AF, OSS, and G Master resolution.
$6,999
Launch priceReleased Jan 2024
FE 300mm F2.8 GM OSS is 4.9 years newer.
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Wins
RF 85mm F1.2L USM
Wins
FE 300mm F2.8 GM OSS
TL;DR — Key differences
- BFE 300mm F2.8 GM OSS has higher OIS effectiveness (5 stops vs 0 stops)
- ARF 85mm F1.2L USM has lower Min focus distance (85 cm vs 200 cm)
- ARF 85mm F1.2L USM has lower Max aperture (Wide) (f/1.2 vs f/2.8)
- ARF 85mm F1.2L USM has lower Max aperture (Tele) (f/1.2 vs f/2.8)
- ARF 85mm F1.2L USM has lower Length (117 mm vs 265 mm)
Key specs at a glance
Size and weight, to scale
RF 85mm F1.2L USM
⌀103 × 117 mm
1195 g (2.63 lb / 42.15 oz)
Credit card
85.6 × 54 mm
for scale
FE 300mm F2.8 GM OSS
⌀124 × 265 mm
1470 g (3.24 lb / 51.85 oz)
RF 85mm F1.2L USM is 148mm shorter and 21mm narrower than FE 300mm F2.8 GM OSS.
RF 85mm F1.2L USM is 275 g lighter than FE 300mm F2.8 GM OSS.
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 85mm F1.2L USM
- ✓
Special elements
Adds 1 UD, 1 Aspherical
- ✓
Min focus distance
85 cm vs 200 cm — lower is better
- ✓
Max aperture (Wide)
f/1.2 vs f/2.8 — lower is better
- ✓
Max aperture (Tele)
f/1.2 vs f/2.8 — lower is better
- ✓
Length
117 mm vs 265 mm — lower is better
- ✓
Weight
1195 g vs 1470 g — lower is better
- ✓
Diameter
103 mm vs 124 mm — lower is better
Reasons to choose the FE 300mm F2.8 GM OSS
- ✓
Special elements
Adds 3 Super ED, 1 ED
- ✓
OIS effectiveness
5 stops vs 0 stops — higher is better
- ✓
Optical stabilization
Only FE 300mm F2.8 GM OSS supports it
- ✓
Custom function button
Only FE 300mm F2.8 GM OSS supports it
- ✓
Max magnification
0.16 × vs 0.12 × — higher is better
Shared specifications
Internal focus
Both support internal focus
Weather sealing
Both support weather sealing
Control ring
Both support control ring
Pros & cons at a glance
Editorially curated highlights and trade-offs.
RF 85mm F1.2L USM
Pros
- ✓Class-leading portrait focal length with f/1.2 aperture
- ✓Exceptional subject isolation and bokeh quality
- ✓Excellent eye-AF tracking on Canon R bodies
- ✓Premium L-series weather sealing
Cons
- –Very heavy (1195g) — tiring for handheld sessions
- –Expensive flagship pricing
- –No built-in stabilization
FE 300mm F2.8 GM OSS
Pros
- ✓Prime design typically delivers strong sharpness and lighter weight
- ✓Built-in optical image stabilization
- ✓Weather-sealed construction for outdoor shooting
Cons
- –Premium price point
- –Relatively heavy for extended handheld use
Decided which one is right for you?
Compare live prices for the RF 85mm F1.2L USM and FE 300mm F2.8 GM OSS at major authorized retailers.
Canon RF 85mm F1.2L USM
Sony FE 300mm F2.8 GM OSS
Affiliate disclosure: As an Amazon Associate, Cameraegg earns from qualifying purchases. Cameraegg may also earn commission from B&H links, at no extra cost to you.
Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.