• 4/3 226.2mm2
  • 20.4 megapixels
  • ISO 200 - 25,600
  • 35mm 858.0mm2
  • 33.0 megapixels
  • ISO 100 - 51,200

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Differences

Olympus E-M1 Mark III advantages over Sony A7 IV

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Longer exposure
    60 vs 30 sec
    Long exposures for night shots
  • Faster shutter
    1/32000 vs 1/8000 sec
    Shoot wide open in bright light

Sony A7 IV advantages over Olympus E-M1 Mark III

  • Larger sensor
    35mm vs 4/3
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 5.12 vs 3.36 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Yes vs No
    Always-on wireless connectivity
  • Newer
    3 years vs 5 years old
    Newer cameras often support more advanced features
  • More dots on screen
    3680k vs 1037k dots
    Can mean greater resolution or a brighter screen
  • More pixels
    33.0 vs 20.4 megapixels
    Higher resolution photos
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Higher extended ISO
    204800 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Focus peaking
    Both provide
    Your camera will highlight what's in focus
  • Tilt-swivel screen
    Both provide
    Tilt and swivel the screen for maximum shooting flexibility
  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • In-Camera Image Stabilization
    Both provide
    Reduces the effects of camera shake at slower shutter speeds
  • Shoot 4K video
    Both provide
    Make sure you have a fast computer
  • Touchscreen
    Both provide
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Dual card slots
    Both provide
    Gives you more storage flexibility
  • Headphone jack
    Both provide
    Monitor audio recording while you shoot video
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Built-in GPS
    Neither provide
    Geotag your photos
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera

User reviews

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Buy the Olympus E-M1 Mark III

Review Excerpt

The Competition

Compared to Olympus E-M1 II

Olympus E-M1 Mark III
Olympus E-M1 II
  • $1699
  • 4/3
  • Newer
  • $899
  • 4/3
  • Less expensive
Sony A7 IV
Olympus E-M1 II
  • $2298
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $899
  • 4/3
  • Lens selection
  • Less expensive

Compared to Panasonic G95

Olympus E-M1 Mark III
Panasonic G95
  • $1699
  • 4/3
  • High resolution composite
  • On-sensor phase detect
  • $848
  • 4/3
  • Less expensive
  • In-camera panoramas
Sony A7 IV
Panasonic G95
  • $2298
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $848
  • 4/3
  • Lens selection
  • Less expensive

Compared to Nikon Z7 II

Olympus E-M1 Mark III
Nikon Z7 II
  • $1699
  • 4/3
  • Tilt-swivel screen
  • High resolution composite
  • $2330
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A7 IV
Nikon Z7 II
  • $2298
  • 35mm
  • Tilt-swivel screen
  • Bigger pixels
  • $2330
  • 35mm
  • On-sensor phase detect
  • Top deck display

Compared to Nikon Z6 II

Olympus E-M1 Mark III
Nikon Z6 II
  • $1699
  • 4/3
  • Tilt-swivel screen
  • High resolution composite
  • $1747
  • 35mm
  • Larger sensor
  • Less expensive
Sony A7 IV
Nikon Z6 II
  • $2298
  • 35mm
  • Tilt-swivel screen
  • In-camera panoramas
  • $1747
  • 35mm
  • Bigger pixels
  • On-sensor phase detect

Compared to OM System OM-1

Olympus E-M1 Mark III
OM System OM-1
  • $1699
  • 4/3
  • $2200
  • 4/3
  • Newer
  • Higher-res screen
Sony A7 IV
OM System OM-1
  • $2298
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $2200
  • 4/3
  • Lens selection
  • High resolution composite
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