GFX 50S IIvs Pentax K-3 Mark IIIvs A6400
Pentax
Pentax K-3 Mark III (2021)
From £1699
Best for DSLR enthusiasts & outdoor photographers
View Pentax K-3 Mark III
Which should you buy?
Studio & Portrait Specialists — GFX 50S II (2021): Medium format quality at the most accessible price ever — 51MP detail and tonal richness no APS-C or full-frame body can replicate.
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.
Content Creation & Vlogging — A6400 (2019): The best value APS-C Sony you can buy — especially used. Real-time Eye AF at this price point was transformative when it launched and still makes it one of the most reliable autofocus systems in the lineup.
Who should buy what
GFX 50S II (2021)
- You want to experience medium format without a five-figure investment
- You shoot landscape, architecture, or portraits where resolution and tonal depth matter
- You're in the Fujifilm ecosystem and want to step up to a larger sensor
Pentax K-3 Mark III (2021)
- You're a committed DSLR photographer with significant investment in Pentax glass
- You shoot in extreme weather conditions and place build quality and reliability above everything
- You prefer optical viewfinder performance and want the best modern APS-C DSLR available
A6400 (2019)
- Vloggers and content creators who need a flip screen and reliable AF
- Photographers upgrading from a compact or smartphone
- Beginners who want room to grow into a full E-mount lens ecosystem
- Anyone prioritising autofocus performance at an accessible price
Quick take: The gfx 50s ii has the highest resolution at 51mp; the a6400 is the most affordable; only the gfx 50s ii, pentax k-3 mark iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | GFX 50S II (2021) | Pentax K-3 Mark III (2021) | A6400 (2019) |
|---|---|---|---|
| Price | £2,999 | £1,699 | £899 |
| Sensor | 51.4MP Medium Format GFX 44×33mm BSI CMOS | 25.7MP APS-C BSI CMOS (AA-filterless) | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 51.4MP | 25.7MP | 24.2MP |
| Video | 4K/30p (cropped) | 4K/30p, 1080p/60p | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | Phase-detect, 425 points | SAFOX 13 phase-detect, 101-point (25 cross-type) | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | 5-axis IBIS, 6.5 stops | 5.5-stop 5-axis IBIS (Shake Reduction III) | None (no IBIS) |
| Burst Rate | 3fps | 12fps | 11fps mechanical, 8fps with AF tracking |
| Battery Life | ~440 shots (CIPA) | 800 shots (CIPA) | ~410 shots (CIPA) |
| Weight | 900g body only | 820g body only | 403g (body, battery, card) |
| Dimensions | 150.0 × 104.2 × 87.2mm | 134.5 × 103.5 × 73.5mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | Yes | Yes | No |
| Viewfinder | EVF, 3.69M dots, 0.77× magnification | Optical pentaprism, 100% coverage, 1.05× magnification | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.2" tilting touchscreen | 3.2" tilting touchscreen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots |
| Mount | Fujifilm G-mount (medium format) | Pentax KF-mount | Sony E-mount |
| Memory Cards | Dual SD UHS-II slots | Dual SD UHS-II | Single SD UHS-I |
| Connectivity | USB-C, Bluetooth, Wi-Fi | USB-C, Wi-Fi, Bluetooth | Micro-USB, Wi-Fi, Bluetooth, NFC |
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