• 35mm 864.0mm2
  • 22.3 megapixels
  • ISO 100 - 25,600
  • 4/3 224.9mm2
  • 16.1 megapixels
  • ISO 160 - 12,800

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Differences

Canon 5D Mark III advantages over Panasonic G5

  • Larger sensor
    35mm vs 4/3
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.25 vs 3.75 microns
    Better low-light and dynamic range (all else equal)
  • Fast startup
    ~0.50 vs 1.3 sec
    Faster startup lets you catch the moment
  • Longer stills battery life
    More info 950 vs 310 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • More pixels
    22.3 vs 16.1 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Bigger JPEG buffer
    63 vs 18 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    102400 vs 12800 ISO
    Higher extended ISO can give more low-light flexibility

Panasonic G5 advantages over Canon 5D Mark III

  • Less expensive
    $500 vs $2299
    Save money for lenses or accessories
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Longer exposure
    60 vs 30 sec
    Long exposures for night shots

Similarities

Common Strengths

  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Built-in GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

Your purchases support this site

Buy the Canon 5D Mark III

Your purchases support this site

Buy the Panasonic G5

Review Excerpt

  • Superb still and video image quality; Powerful, fast, and accurate AF system with loads of cross-type points, loads of configurability and great frame coverage; Rugged, weather-sealed body with great control layout and user-interface configurability.

  • Dynamic range is limited by noise in deep shadows; Somewhat heavy-handed noise suppression and sharpening at default settings. (Shooting RAW avoids both.); No AF illuminator.

  • Small, compact body with excellent focusing and exposure capabilities; Newly enhanced touchpanel LCD screen makes image capture and review a joy; Excellent HD video recording quality.

  • Some controls difficult to access; Too easy to activate menus and options while shooting; Lack of a microphone-in jack limits video recording usefulness.

The Competition

Compared to Canon 6D

Canon 5D Mark III
Canon 6D
  • $2079
  • 35mm
  • More cross-type AF points
  • Less shutter lag
  • $1499
  • 35mm
  • Less expensive
  • Built-in Wi-Fi
Panasonic G5
Canon 6D
  • $500
  • 4/3
  • Less expensive
  • Touchscreen
  • $1499
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Canon 5D Mark IV

Canon 5D Mark III
Canon 5D Mark IV
  • $2079
  • 35mm
  • Less expensive
  • Bigger pixels
  • $2249
  • 35mm
  • Shoot 4K video
  • Touchscreen
Panasonic G5
Canon 5D Mark IV
  • $500
  • 4/3
  • Less expensive
  • Tiltable Screen
  • $2249
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Sony A850

Canon 5D Mark III
Sony A850
  • $2079
  • 35mm
  • Lens selection
  • Higher effective ISO
  • $2219
  • 35mm
  • In-Camera Image Stabilization
Panasonic G5
Sony A850
  • $500
  • 4/3
  • Lens selection
  • Touchscreen
  • $2219
  • 35mm
  • Larger sensor
  • In-Camera Image Stabilization

Compared to Nikon D800E

Canon 5D Mark III
Nikon D800E
  • $2079
  • 35mm
  • Bigger pixels
  • More cross-type AF points
  • $2212
  • 35mm
  • Fast startup
  • Higher effective ISO
Panasonic G5
Nikon D800E
  • $500
  • 4/3
  • Touchscreen
  • Tiltable Screen
  • $2212
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Sony A99

Canon 5D Mark III
Sony A99
  • $2079
  • 35mm
  • Lens selection
  • Fast startup
  • $1998
  • 35mm
  • Focus peaking
  • Tilt-swivel screen
Panasonic G5
Sony A99
  • $500
  • 4/3
  • Lens selection
  • Touchscreen
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
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