Pentax K-3 II vs Sony A7R III

Sony A7R III advantages over Pentax K-3 II

• Larger sensor
  35mm vs APS-C
  More sensor area. Bigger is (generally) better.
• Bigger pixels
  ~ 4.51 vs 3.91 microns
  Better low-light and dynamic range (all else equal)
• Shoot 4K video
  4K (UHD) vs 1080p
  Make sure you have a fast computer
• Touchscreen
  Touch vs No touch
  Interact with your camera just like your smartphone
• Tiltable Screen
  Tiltable vs Fixed
  Tilt the screen for shooting flexbility
• Built-in Wi-Fi
  Wi-Fi vs None
  Share your photos wirelessly
• NFC
  Yes vs No
  Simplifies pairing your camera with supported phones
• Built-in Bluetooth
  Yes vs No
  Always-on wireless connectivity
• Better color depth

  Better color depth

  Color depth refers to the number of unique colors that a sensor can faithfully capture. Cameras with better color depth will demonstrate smoother transitions from one color to the next, and avoid "banding" in areas with subtle shading. (Blue skies are an example of where you might see color banding.)

  More color depth is generally better, but you'll struggle to notice a difference between two cameras with less than 1 bit of difference. Color depth above 22 bits is considered excellent.

  Want to learn more? Head over to our full glossary entry on color depth

  Color depth test data courtesy of DxO Mark.

  A7R III test data on DxO Mark K-3 II test data on DxO Mark
  26.0 vs 23.6 bits
  Capture richer, more accurate colors
• Higher effective ISO

  Higher effective ISO

  Maximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.

  Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.

  You can learn more at our glossary entry.

  Maximum effective ISO test data courtesy of DxO Mark.

  A7R III test data on DxO Mark K-3 II test data on DxO Mark
  3,523 vs 1,106 iso
  Take photos in low light with less noise
• On-sensor phase detect
  Yes vs No
  Usually improves live view and video AF performance
• More viewfinder magnification
  0.78x vs 0.63x
  Get a bigger view of the scene through the eye-level viewfinder
• More pixels
  42.4 vs 24.4 megapixels
  Higher resolution photos
• Faster JPEG shooting
  9.9 fps vs 8.1 fps
  Faster JPEG shooting (burst mode)
• Faster RAW shooting
  9.2 fps vs 8.2 fps
  Faster RAW shooting in burst mode
• Slow-motion videos
  Yes vs No
  Shoot slow-motion videos
• Higher extended ISO
  102400 vs 51200 ISO
  Higher extended ISO can give more low-light flexibility