• 35mm 849.7mm2
  • 61.0 megapixels
  • ISO 100 - 32,000
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Sony A7R IV advantages over Pentax K-3 III

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • 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
    61.0 vs 25.7 megapixels
    Higher resolution photos
  • Bigger JPEG buffer
    70 vs 30 shots
    Take more JPEG shots before waiting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

Pentax K-3 III advantages over Sony A7R IV

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Less expensive
    $2344 vs $2990*
    Save money for lenses or accessories
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Newer
    4 years vs 5 years old
    Newer cameras often support more advanced features
  • Higher-res screen
    540k vs 360k 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
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Faster JPEG shooting
    12.0 fps vs 10.0 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
  • Touchscreen
    Both provide
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • Built-in Bluetooth
    Both provide
    Always-on wireless connectivity
  • 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

  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • 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 IV
Body Only
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Your purchases support this site

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

  • Outstanding image quality; Excellent high ISOs; Fast AF performance with Eye-AF tracking; 10fps bursts at full-resolution; Improved ergonomics; Dual UHS-II card slots; Higher-res EVF.

  • Expensive; No 4Kp60; Buffer clearing could be faster; Menus are still frustrating; Touchscreen underutilized; No built-in flash.

  • Read our Sony A7R IV Review

The Competition

Compared to Pentax KP

Sony A7R IV
Pentax KP
  • $3217
  • 35mm
  • Larger sensor
  • Shoot 4K video
  • $999
  • APS-C
  • Less expensive
  • Lens selection

Compare Sony A7R IV 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 Canon 90D

Sony A7R IV
Canon 90D
  • $3217
  • 35mm
  • Focus peaking
  • Larger sensor
  • $1099
  • APS-C
  • Lens selection
  • Less expensive

Compare Sony A7R IV vs Canon 90D

Pentax K-3 III
Canon 90D
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1099
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compare Pentax K-3 III vs Canon 90D

Compared to Canon R5

Sony A7R IV
Canon R5
  • $3217
  • 35mm
  • Less expensive
  • High resolution composite
  • $3349
  • 35mm
  • Tilt-swivel screen
  • Bigger pixels

Compare Sony A7R IV vs Canon R5

Pentax K-3 III
Canon R5
  • $1847
  • APS-C
  • Less expensive
  • High resolution composite
  • $3349
  • 35mm
  • Tilt-swivel screen
  • Larger sensor

Compare Pentax K-3 III vs Canon R5

Compared to Nikon Z7 II

Sony A7R IV
Nikon Z7 II
  • $3217
  • 35mm
  • High resolution composite
  • NFC
  • $2330
  • 35mm
  • Less expensive
  • Bigger pixels

Compare Sony A7R IV vs Nikon Z7 II

Pentax K-3 III
Nikon Z7 II
  • $1847
  • APS-C
  • High resolution composite
  • More viewfinder magnification
  • $2330
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-3 III vs Nikon Z7 II

Compared to Sony A1

Sony A7R IV
Sony A1
  • $3217
  • 35mm
  • Less expensive
  • High resolution composite
  • $5998
  • 35mm
  • Slower slow-motion
  • Longer video battery life

Compare Sony A7R IV vs Sony A1

Pentax K-3 III
Sony A1
  • $1847
  • APS-C
  • Lens selection
  • Less expensive
  • $5998
  • 35mm
  • Larger sensor
  • Tiltable Screen

Compare Pentax K-3 III vs Sony A1

Compare Other Cameras?