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GFX 100Svs Pentax K-3 Mark III

GearFrame · Updated March 2026

Fujifilm GFX 100S Fujifilm GFX 100S (2021) Starting from £3999 new Best for Commercial, portrait & landscape photographers View GFX 100S
VS
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

GearScore™ Verdict — Which should you buy?

Commercial, Portrait & Landscape Photographers — GFX 100S (2021): 102MP medium-format with IBIS and phase-detect AF at a price that made serious large-format imaging available to a new generation of photographers.

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.

↓ Full specifications below

GFX 100S (2021)

  • Portrait and commercial photographers who need extraordinary resolution and rendering
  • Landscape photographers who want the finest large-format detail in a manageable body
  • GFX 50S II users who want to double their resolution with improved AF
  • Studio photographers moving up from full-frame who want medium-format colour science

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

Quick take: The gfx 100s has the highest resolution at 102mp; the pentax k-3 mark iii is the most affordable. Scroll down for the full spec breakdown.

Full specifications

Specification GFX 100S (2021)Pentax K-3 Mark III (2021)
Price £3,999 £1,699
Sensor 102MP Medium Format BSI CMOS (43.8 × 32.9mm) 25.7MP APS-C BSI CMOS (AA-filterless)
Resolution 102.0MP 25.7MP
Video 4K/30p, FHD/120p 4K/30p, 1080p/60p
Autofocus Phase-detect hybrid AF, face/eye detection SAFOX 13 phase-detect, 101-point (25 cross-type)
Stabilisation IBIS — up to 6 stops 5.5-stop 5-axis IBIS (Shake Reduction III)
Burst Rate 5fps 12fps
Battery Life ~460 shots (CIPA) 800 shots (CIPA)
Weight 900g (with battery and card) 820g body only
Dimensions 150.0 × 104.2 × 87.2mm 134.5 × 103.5 × 73.5mm
Weather Sealed Yes Yes
Viewfinder EVF, 5.76M dots, 0.77× magnification Optical pentaprism, 100% coverage, 1.05× magnification
Screen 3.0" 3-direction tilting touchscreen 3.2" tilting touchscreen
Mount Fujifilm GFX (G-mount) Pentax KF-mount
Memory Cards Single CFexpress Type B / SD UHS-II combo slot Dual SD UHS-II
Connectivity USB-C, Wi-Fi, Bluetooth USB-C, Wi-Fi, Bluetooth
Genre GFX 100SPentax K-3 Mark III
Portrait
9.0
7.0
Landscape
9.0
9.0
Architecture
9.0
Travel
7.0
7.0
Sports & Action
4.0
9.0
Vlogging & Video
4.0
4.0
Wildlife
9.0

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

⚡ Compare specs side by side GFX 100S prices → Pentax K-3 Mark III prices →

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