OM System
M.Zuiko Digital ED 12-40mm F2.8 PRO II
Micro Four Thirds Mount
IP53 weather-sealed standard zoom with constant F2.8, MSC autofocus, and 0.3× magnification at 40mm.
$1,299
Launch priceReleased Feb 2022
Sony
FE 50mm F1.2 GM
Sony E Mount
Exquisite resolution and dreamy bokeh combine in a masterful f/1.2 prime.
$1,999
Launch priceReleased Mar 2021
M.Zuiko Digital ED 12-40mm F2.8 PRO II is 11 months newer.
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Wins
M.Zuiko Digital ED 12-40mm F2.8 PRO II
Wins
FE 50mm F1.2 GM
1 categories tied
Which would you choose?
TL;DR — Key differences
- BFE 50mm F1.2 GM has lower Max aperture (Wide) (f/1.2 vs f/2.8)
- BFE 50mm F1.2 GM has lower Max aperture (Tele) (f/1.2 vs f/2.8)
- AM.Zuiko Digital ED 12-40mm F2.8 PRO II has lower Weight (382 g vs 778 g)
- AM.Zuiko Digital ED 12-40mm F2.8 PRO II has lower Min focus distance (20 cm vs 40 cm)
- AM.Zuiko Digital ED 12-40mm F2.8 PRO II has higher Max magnification (0.3 × vs 0.17 ×)
Key specs at a glance
Size and weight, to scale
📸 Snap this lens size diff to shareM.Zuiko Digital ED 12-40mm F2.8 PRO II
⌀70 × 84 mm
382 g (0.84 lb / 13.47 oz)
Credit card
85.6 × 54 mm
for scale
FE 50mm F1.2 GM
⌀87 × 108 mm
778 g (1.72 lb / 27.44 oz)
M.Zuiko Digital ED 12-40mm F2.8 PRO II is 24mm shorter and 17mm narrower than FE 50mm F1.2 GM.
M.Zuiko Digital ED 12-40mm F2.8 PRO II is 396 g lighter than FE 50mm F1.2 GM.
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 M.Zuiko Digital ED 12-40mm F2.8 PRO II
- ✓
Special elements
Adds 1 EDA, 2 Aspherical, 1 DSA…
- ✓
Weight
382 g vs 778 g — lower is better
- ✓
Min focus distance
20 cm vs 40 cm — lower is better
- ✓
Length
84 mm vs 108 mm — lower is better
- ✓
Diameter
69.9 mm vs 87 mm — lower is better
- ✓
Max magnification
0.3 × vs 0.17 × — higher is better
Reasons to choose the FE 50mm F1.2 GM
- ✓
Special elements
Adds 3 XA (extreme aspherical)
- ✓
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
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.
M.Zuiko Digital ED 12-40mm F2.8 PRO II
Pros
- ✓Constant F2.8 across 12–40mm (24–80mm equiv.)
- ✓IP53 dust/splash/freeze resistance with ZERO coating
- ✓Compact 382g body with MF clutch and L-Fn button
Cons
- –No lens-based IS — relies on Sync IS in compatible bodies
- –Extending barrel design
FE 50mm F1.2 GM
Pros
- ✓Outstanding sharpness wide open at f/1.2
- ✓Stunningly smooth, circular bokeh with 11 aperture blades
- ✓Extremely quiet and fast autofocus tracking
- ✓Manageable size and weight for an f/1.2 lens
Cons
- –Expensive investment for a single focal length
- –Heavy compared to standard f/1.8 options
- –Some visible vignetting wide open
Decided which one is right for you?
Compare live prices for the M.Zuiko Digital ED 12-40mm F2.8 PRO II and FE 50mm F1.2 GM at major authorized retailers.
OM System M.Zuiko Digital ED 12-40mm F2.8 PRO II
Sony FE 50mm F1.2 GM
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.