Canon
RF 50mm F1.2L USM
Canon RF Mount
Flagship RF 50mm f/1.2 L prime with Ring USM, 15-element design, and weather-sealed L-series build.
$2,299
Launch priceReleased Dec 2018
OM System
M.Zuiko Digital ED 20mm F1.4 PRO
Micro Four Thirds Mount
40mm-equiv. F1.4 wide prime with 25 cm close focus, 58 mm filter thread, and IPX1 weather sealing.
$799
Launch priceReleased Oct 2020
M.Zuiko Digital ED 20mm F1.4 PRO is 1.8 years newer.
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Wins
RF 50mm F1.2L USM
Wins
M.Zuiko Digital ED 20mm F1.4 PRO
1 categories tied
Which would you choose?
TL;DR — Key differences
- BM.Zuiko Digital ED 20mm F1.4 PRO has lower Weight (247 g vs 950 g)
- BM.Zuiko Digital ED 20mm F1.4 PRO has lower Length (61.7 mm vs 108 mm)
- ARF 50mm F1.2L USM has higher Max magnification (0.19 × vs 0.11 ×)
- BM.Zuiko Digital ED 20mm F1.4 PRO has lower Min focus distance (25 cm vs 40 cm)
- BM.Zuiko Digital ED 20mm F1.4 PRO has lower Diameter (63.4 mm vs 89.8 mm)
Key specs at a glance
Size and weight, to scale
📸 Snap this lens size diff to share
RF 50mm F1.2L USM
⌀90 × 108 mm
950 g (2.09 lb / 33.51 oz)
Credit card
85.6 × 54 mm
for scale
M.Zuiko Digital ED 20mm F1.4 PRO
⌀63 × 62 mm
247 g (0.54 lb / 8.71 oz)
RF 50mm F1.2L USM is 46mm longer and 26mm wider than M.Zuiko Digital ED 20mm F1.4 PRO.
RF 50mm F1.2L USM is 703 g heavier than M.Zuiko Digital ED 20mm F1.4 PRO.
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 50mm F1.2L USM
- ✓
Special elements
Adds 1 UD
- ✓
Max aperture (Wide)
f/1.2 vs f/1.4 — lower is better
- ✓
Max aperture (Tele)
f/1.2 vs f/1.4 — lower is better
- ✓
Max magnification
0.19 × vs 0.11 × — higher is better
Reasons to choose the M.Zuiko Digital ED 20mm F1.4 PRO
- ✓
Weight
247 g vs 950 g — lower is better
- ✓
Special elements
Adds 1 Super ED, 2 ED
- ✓
Custom function button
Only M.Zuiko Digital ED 20mm F1.4 PRO supports it
- ✓
Length
61.7 mm vs 108 mm — lower is better
- ✓
Min focus distance
25 cm vs 40 cm — lower is better
- ✓
Diameter
63.4 mm vs 89.8 mm — lower 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 50mm F1.2L USM
Pros
- ✓Stunning sharpness even wide open at f/1.2
- ✓Beautiful, smooth bokeh with 10 rounded aperture blades
- ✓Fast and accurate Dual Pixel AF with Ring USM
- ✓Weather-sealed L-series construction
Cons
- –Heavy for a 50mm prime (950g)
- –Premium price for a single focal length
- –No optical image stabilization
M.Zuiko Digital ED 20mm F1.4 PRO
Pros
- ✓Bright f/1.4 aperture for low light and subject separation
- ✓Prime design typically delivers strong sharpness and lighter weight
- ✓Weather-sealed construction for outdoor shooting
- ✓Lightweight design easy to carry all day
Cons
- –Third-party or older alternatives may offer better value
Decided which one is right for you?
Compare live prices for the RF 50mm F1.2L USM and M.Zuiko Digital ED 20mm F1.4 PRO at major authorized retailers.
Canon RF 50mm F1.2L USM
OM System M.Zuiko Digital ED 20mm F1.4 PRO
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.