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Pentax K-3 Mark IIIvs RX100 VI

GearFrame · Updated March 2026

Pentax Pentax K-3 Mark III Pentax Pentax K-3 Mark III (2021) Starting from £1699 new Best for DSLR enthusiasts & outdoor photographers View Pentax K-3 Mark III
VS
Sony RX100 VI Sony RX100 VI (2018) Starting from £700 new Best for Travel & Vlogging View RX100 VI

GearScore™ Verdict — Which should you buy?

Dslr Enthusiasts & Outdoor Photographers — Pentax K-3 Mark III (2021): The finest APS-C DSLR ever made — class-leading weather sealing, optical viewfinder, 5-axis IBIS, and extraordinary build for photographers committed to DSLR.

Travel & Vlogging — RX100 VI (2018): The RX100 VI trades fast apertures for a remarkable 24-200mm zoom range — giving it more versatility than any previous model. 4K/30p, 24fps burst, a pop-up EVF, and an articulating screen round out an exceptional compact package. Variable aperture limits low-light performance at the long end, but for travel and events where reach matters, there is no practical alternative at this size.

↓ Full specifications below

Pentax K-3 Mark III (2021)

  • DSLR photographers who want the finest APS-C optical viewfinder experience
  • Outdoor and weather photographers who need robust all-weather sealing
  • Pentax lens owners who want to use their existing K-mount glass
  • Photographers who prefer optical viewfinders and refuse to switch to mirrorless

RX100 VI (2018)

  • Travel photographers who need versatile reach in a pocketable body
  • Vloggers and content creators who need 4K and an articulating screen
  • Event photographers who want discreet, capable wide-to-tele coverage
  • Wildlife and sports enthusiasts who want a compact travel option

Quick take: The pentax k-3 mark iii has the highest resolution at 26mp; the rx100 vi is the most affordable; only the pentax k-3 mark iii is weather sealed. Scroll down for the full spec breakdown.

Full specifications

Specification Pentax K-3 Mark III (2021)RX100 VI (2018)
Price £1,699 £700
Sensor 25.7MP APS-C BSI CMOS (AA-filterless) 20.1MP 1-inch BSI Stacked CMOS
Resolution 25.7MP 20.1MP
Video 4K/30p, 1080p/60p 4K/30p, 1080p/120p, 960fps HFR
Autofocus SAFOX 13 phase-detect, 101-point (25 cross-type) Fast Hybrid AF, 315 phase-detect points, Eye AF
Stabilisation 5.5-stop 5-axis IBIS (Shake Reduction III) Optical SteadyShot
Burst Rate 12fps 24fps
Battery Life 800 shots (CIPA) ~240 shots (CIPA)
Weight 820g body only 301g (with battery and card)
Dimensions 134.5 × 103.5 × 73.5mm 101.6 × 58.1 × 42.8mm
Weather Sealed Yes No
Viewfinder Optical pentaprism, 100% coverage, 1.05× magnification Pop-up EVF, 2.35M dots
Screen 3.2" tilting touchscreen 3.0" fully articulating touchscreen, 921k dots
Mount Pentax KF-mount Fixed Zeiss Vario-Sonnar T* 24-200mm f/2.8-4.5
Memory Cards Dual SD UHS-II Single SD / Memory Stick PRO Duo slot
Connectivity USB-C, Wi-Fi, Bluetooth Micro USB, Wi-Fi, Bluetooth
Genre Pentax K-3 Mark IIIRX100 VI
Landscape
9.0
6.5
Wildlife
9.0
7.5
Sports & Action
9.0
7.5
Portrait
7.0
7.0
Travel
7.0
9.0
Vlogging & Video
4.0
8.5
Street
8.5
Casual
8.5

GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →

⚡ Compare specs side by side Pentax K-3 Mark III prices → RX100 VI prices →

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