OM System
OM-D E-M5 Mark III
Compact pro MFT with IBIS and weather sealing.
$1,199
Released Oct 2019
Sony
Alpha 1 II
50MP stacked flagship with 30fps RAW, 8K video, and Sony's fastest hybrid performance.
$6,499
Released Nov 2024
Alpha 1 II is 5.1 years newer.
Wins
OM-D E-M5 Mark III
Wins
Alpha 1 II
3 categories tied
Check current prices
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TL;DR — Key differences
- BAlpha 1 II has higher EVF resolution (9,437,184 vs 2,360,000)
- BAlpha 1 II has higher RAW buffer depth (200 frames vs 60 frames)
- BAlpha 1 II has higher Resolution (50.1 MP vs 20.4 MP)
- BAlpha 1 II has higher Burst (electronic) (30 fps vs 15 fps)
- BAlpha 1 II has higher 4K max frame rate (120 fps vs 60 fps)
Key specs at a glance
Size and weight, to scale
OM-D E-M5 Mark III
134 × 91 × 72 mm
580 g (1.28 lb / 20.46 oz)
Alpha 1 II
136 × 97 × 83 mm
743 g (1.64 lb / 26.21 oz)
OM-D E-M5 Mark III is 2mm narrower, 6mm shorter, and 11mm thinner than Alpha 1 II.
OM-D E-M5 Mark III is 163 g lighter than Alpha 1 II.
Depth (front-to-back): 72mm OM-D E-M5 Mark III · 83mm Alpha 1 II
Sensor size, to scale
OM-D E-M5 Mark III
17.3 × 13 mm · Micro Four Thirds
225 mm² area
Alpha 1 II
35.9 × 24 mm · Full Frame
862 mm² area
3.8× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
OM-D E-M5 Mark III
Micro Four Thirds
130+
native lenses available
Alpha 1 II
✓ more lensesSony E
350+
native lenses available
Counts include current first-party and major third-party native autofocus lenses.
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
OM-D E-M5 Mark III
AF low-light limit
-7 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 134, 91, 72
AF points / zones
1053 vs 759 — higher is better
Subject recognition
Adds Vehicle
Weight
580 g vs 743 g — lower is better
Battery life (CIPA)
640 shots vs 520 shots — higher is better
AF frame coverage
100 % vs 94 % — higher is better
Reasons to choose
Alpha 1 II
Dimensions (W×H×D mm)
Adds 136.1, 96.9, 82.9
EVF resolution
9,437,184 vs 2,360,000 — higher is better
RAW buffer depth
200 frames vs 60 frames — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
Resolution
50.1 MP vs 20.4 MP — higher is better
Subject recognition
Adds Insect, Car/Train, Airplane
Burst (electronic)
30 fps vs 15 fps — higher is better
4K max frame rate
120 fps vs 60 fps — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓Max video bit rate — Both 150 Mbps
Pros & cons at a glance
Editorially curated highlights and trade-offs.
OM-D E-M5 Mark III
Pros
- ✓Compact pro
- ✓Weather sealed
- ✓IBIS
Cons
- –Older
- –MFT
- –Superseded
Alpha 1 II
Pros
- ✓50MP stacked sensor
- ✓30fps blackout-free burst
- ✓8K 30p video
- ✓Best Sony AF
Cons
- –Very expensive
- –Complex menus
- –Large files
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for landscape, OM-D E-M5 Mark III or Alpha 1 II?
Alpha 1 II scores 9.0/10 versus 3.5/10 for OM-D E-M5 Mark III — 50.1MP — massive detail for large prints.
What's the resolution difference between the OM-D E-M5 Mark III and Alpha 1 II?
OM-D E-M5 Mark III is 20.4 MP and Alpha 1 II is 50.1 MP, so the Alpha 1 II captures more detail for cropping and large prints.
Do the OM-D E-M5 Mark III and Alpha 1 II have in-body image stabilization?
OM-D E-M5 Mark III has 6-stop in-body image stabilization, while alpha 1 II has 8.5-stop in-body image stabilization.
Which shoots faster bursts — the OM-D E-M5 Mark III or the Alpha 1 II?
OM-D E-M5 Mark III reaches 15 fps electronic. Alpha 1 II reaches 30 fps electronic.
What's the weight difference between the OM-D E-M5 Mark III and Alpha 1 II?
OM-D E-M5 Mark III weighs 580 g and Alpha 1 II weighs 743 g, so the OM-D E-M5 Mark III is 163 g lighter.
Do the OM-D E-M5 Mark III and Alpha 1 II record 4K video?
OM-D E-M5 Mark III: 4K up to 60p. Alpha 1 II: 8K (max), 4K up to 120p.
Are the OM-D E-M5 Mark III and Alpha 1 II weather sealed?
OM-D E-M5 Mark III: Yes. Alpha 1 II: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the OM-D E-M5 Mark III and 520 shots for the Alpha 1 II, giving the OM-D E-M5 Mark III the edge.
How much does each cost?
OM-D E-M5 Mark III launched at $1,199 and Alpha 1 II at $6,499. The OM-D E-M5 Mark III is $5,300 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of OM System and Sony press materials.