• 35mm 861.6mm2
  • 42.4 megapixels
  • ISO 100 - 25,600
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Sony A7R II advantages over Pentax K-3 III

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 4.51 vs 3.76 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • More pixels
    42.4 vs 25.7 megapixels
    Higher resolution photos
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

Pentax K-3 III advantages over Sony A7R II

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Less expensive
    $2344 vs $2898*
    Save money for lenses or accessories
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • Built-in Bluetooth
    Yes vs No
    Always-on wireless connectivity
  • Longer stills battery life
    More info 800 vs 340 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Newer
    3 years vs 9 years old
    Newer cameras often support more advanced features
  • Higher-res screen
    540k vs 307k pixels
    More detail on the screen lets you judge focus and composition
  • More viewfinder magnification
    1.05x vs 0.78x
    Get a bigger view of the scene through the eye-level viewfinder
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Faster JPEG shooting
    12.0 fps vs 5.0 fps
    Faster JPEG shooting (burst mode)
  • Higher extended ISO
    1600000 vs 102400 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
  • 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
  • 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
  • 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

  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • Built-in GPS
    Neither provide
    Geotag your photos
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash

User reviews

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Buy the Sony A7R II
Body Only
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Buy the Pentax K-3 III
Body Only
  • Body Only
  • Kit with 20-40mm F2.8-4 Lens
  • Kit with 55-300mm f/4.5-6.3 Lens
All K-3 III Deals

Review Excerpt

  • Superb image quality; Very high resolution; Surprisingly good high ISO performance; Fast autofocus; Compact, comfortable body with lots of customization potential; Bright, roomy and clear viewfinder; Tilting LCD display; Five-axis stabilization; Intuitive Wi-Fi / NFC connectivity

  • Movie button is poorly located; No touch screen; Not as fast to start up or shoot photos as a similarly-priced SLR; Rather slow buffer clearing; No built-in flash; Single card slot; Not weather-sealed to the same degree as some rivals

  • Read our Sony A7R II Review

The Competition

Compared to Sony A7R

Sony A7R II
Sony A7R
  • $2898
  • 35mm
  • In-Camera Image Stabilization
  • Shoot 4K video
  • $1799
  • 35mm
  • Less expensive
  • Lighter weight

Compare Sony A7R II vs Sony A7R

Pentax K-3 III
Sony A7R
  • $1847
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization
  • $1799
  • 35mm
  • Less expensive
  • Larger sensor

Compare Pentax K-3 III vs Sony A7R

Compared to Pentax KP

Sony A7R II
Pentax KP
  • $2898
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $999
  • APS-C
  • Lens selection
  • Less expensive

Compare Sony A7R II vs Pentax KP

Pentax K-3 III
Pentax KP
  • $1847
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $999
  • APS-C
  • Less expensive
  • Tiltable Screen

Compare Pentax K-3 III vs Pentax KP

Compared to Sony A9

Sony A7R II
Sony A9
  • $2898
  • 35mm
  • In-camera panoramas
  • More pixels
  • $3295
  • 35mm
  • Bigger pixels
  • Touchscreen

Compare Sony A7R II vs Sony A9

Pentax K-3 III
Sony A9
  • $1847
  • APS-C
  • Lens selection
  • Less expensive
  • $3295
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-3 III vs Sony A9

Compared to Sony A7R III

Sony A7R II
Sony A7R III
  • $2898
  • 35mm
  • In-camera panoramas
  • $2248
  • 35mm
  • Less expensive
  • Touchscreen

Compare Sony A7R II vs Sony A7R III

Pentax K-3 III
Sony A7R III
  • $1847
  • APS-C
  • Lens selection
  • Longer stills battery life
  • $2248
  • 35mm
  • Larger sensor
  • Less expensive

Compare Pentax K-3 III vs Sony A7R III

Compared to Canon 90D

Sony A7R II
Canon 90D
  • $2898
  • 35mm
  • Focus peaking
  • Larger sensor
  • $1199
  • APS-C
  • Lens selection
  • Less expensive

Compare Sony A7R II vs Canon 90D

Pentax K-3 III
Canon 90D
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1199
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compare Pentax K-3 III vs Canon 90D

Compare Other Cameras?