• 35mm 855.6mm2
  • 24.3 megapixels
  • 35.00mm (35mm eq.)
  • APS-C 366.6mm2
  • 24.4 megapixels
  • ISO 100 - 51,200

Buy From

Differences

Sony RX1R advantages over Pentax K-3

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 5.97 vs 3.91 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Higher effective ISO
    2,537 vs 1,216 iso
    Take photos in low light with less noise
  • Higher max flash sync
    1/4000 vs 1/180 sec
    Reduce the effect of ambient light in flash shots

Pentax K-3 advantages over Sony RX1R

  • Eye-level viewfinder
    Eye-level vs Rear display only
    You'll be able to frame photos even when the sun is out
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Fast startup
    ~0.90 vs 1.7 sec
    Faster startup lets you catch the moment
  • Longer stills battery life
    More info 560 vs 220 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Less shutter lag
    0.14 vs 0.27 sec
    Focus and take a photo quickly (wide angle)
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Faster JPEG shooting
    7.1 fps vs 5.1 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    75 vs 15 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster RAW shooting
    7.1 fps vs 5.2 fps
    Faster RAW shooting in burst mode
  • Bigger RAW buffer
    24 vs 15 shots
    Larger buffer for RAW shots (burst mode)
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    51200 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Rear display
    Both provide
    Review photos on the back of the camera
  • Focus peaking
    Both provide
    Your camera will highlight what's in focus
  • RAW file ability
    Both provide
    Gives you more flexibility to develop your photos later
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • Manual focus
    Both provide
    AF is for the weak. Real photographers focus manually.
  • 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
  • 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
  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • Tiltable Screen
    Neither provide
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • 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
  • Integrated ND filter
    Neither provide
    Shoot in daylight with a large aperture or slow shutter
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

Your purchases support this site

Buy the Sony RX1R
Sony RX1R
All RX1R Deals

Your purchases support this site

Buy the Pentax K-3
Body Only
  • Body Only
  • Kit with 18-135mm Lens
All K-3 Deals

Review Excerpt

  • Significantly sharper, more detailed JPEG images than those from the RX1; JPEG processing appears to minimize moire and aliasing artifacts; Same price as the RX1; Full-frame, 24-megapixel compact camera with fast Carl Zeiss Sonnar 35mm f/2 T* lens; Blazing fast autofocus; Impressive image quality that rivals (and sometimes surpasses) full-frame DSLRs.

  • More prone to moire, aliasing and false color than the RX1; Only subtle improvement in sharpness in RAW files; Fixed-length lens limits shooting flexibility; Viewfinders (optical or electronic) only available as optional accessories; Extremely expensive for a compact camera.

  • Read our Sony RX1R Review

  • Top-notch image quality; Great ergonomics in a compact body; Unique on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots; Optional Wi-Fi remote control

  • AE Lock button is poorly located; Below-average battery life for a DSLR; Rather dated-looking menu system; Requires a different battery grip accessory than its predecessors; Less third-party support than some rivals

  • Read our Pentax K-3 Review

The Competition

Compared to Sony RX1

Sony RX1R
Sony RX1
  • $2598
  • 35mm
  • Lacks anti-aliasing filter
  • $2398
  • 35mm
  • Has anti-aliasing filter

Compare Sony RX1R vs Sony RX1

Pentax K-3
Sony RX1
  • $699
  • APS-C
  • Eye-level viewfinder
  • In-Camera Image Stabilization
  • $2398
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-3 vs Sony RX1

Compared to Nikon D7100

Sony RX1R
Nikon D7100
  • $2598
  • 35mm
  • Focus peaking
  • Larger sensor
  • $750
  • APS-C
  • Less expensive
  • Eye-level viewfinder

Compare Sony RX1R vs Nikon D7100

Pentax K-3
Nikon D7100
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $750
  • APS-C
  • Fast startup
  • Longer stills battery life

Compare Pentax K-3 vs Nikon D7100

Compared to Nikon D7200

Sony RX1R
Nikon D7200
  • $2598
  • 35mm
  • Focus peaking
  • Larger sensor
  • $1021
  • APS-C
  • Less expensive
  • Eye-level viewfinder

Compare Sony RX1R vs Nikon D7200

Pentax K-3
Nikon D7200
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1021
  • APS-C
  • Fast startup
  • Built-in Wi-Fi

Compare Pentax K-3 vs Nikon D7200

Compared to Sony RX1R II

Sony RX1R
Sony RX1R II
  • $2598
  • 35mm
  • Less expensive
  • Bigger pixels
  • $3298
  • 35mm
  • Eye-level viewfinder
  • Tiltable Screen

Compare Sony RX1R vs Sony RX1R II

Pentax K-3
Sony RX1R II
  • $699
  • APS-C
  • In-Camera Image Stabilization
  • Fast startup
  • $3298
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-3 vs Sony RX1R II

Compared to Zeiss ZX1

Sony RX1R
Zeiss ZX1
  • $2598
  • 35mm
  • Focus peaking
  • Bigger pixels
  • $6000
  • 35mm
  • Eye-level viewfinder
  • Shoot 4K video

Compare Sony RX1R vs Zeiss ZX1

Pentax K-3
Zeiss ZX1
  • $699
  • APS-C
  • Less expensive
  • Focus peaking
  • $6000
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-3 vs Zeiss ZX1

Compare Other Cameras?