GFX 50S IIvs A6700vs A7S 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.
All-Round & Video — A6700 (2023): Best-in-class autofocus and 4K/120p video in a compact APS-C body — the standout camera under £1,000.
Professional Video & Low-Light Filmmaking — A7S III (2020): If video is your primary discipline, the A7S III is the camera. 4K/120p at 10-bit in a weather-sealed body with a 9.44M dot EVF is an extraordinary package. The 12MP sensor isn't limiting for video — and it's usable at ISO 409,600 in a pinch.
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
A6700 (2023)
- You want a compact, travel-friendly system without sacrificing autofocus performance
- You're an enthusiast upgrading from an entry-level camera and ready for a more capable body
- You shoot wildlife or sports and want APS-C reach from a lightweight kit
- You create video content and need reliable subject and eye tracking in a small form factor
A7S III (2020)
- Filmmakers and videographers who need 4K/120p at 10-bit
- Event videographers who shoot in dark venues regularly
- Documentary filmmakers who need reliable AF and weather sealing
- Hybrid shooters where video is primary and stills are secondary
Quick take: The gfx 50s ii has the highest resolution at 51mp; the a6700 is the most affordable; only the gfx 50s ii, a7s iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | GFX 50S II (2021) | A6700 (2023) | A7S III (2020) |
|---|---|---|---|
| Price | £2,999 | £999 | £2,999 |
| Sensor | 51.4MP Medium Format GFX 44×33mm BSI CMOS | 26MP APS-C Exmor R BSI CMOS | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 51.4MP | 26.0MP | 12.1MP |
| Video | 4K/30p (cropped) | 4K/120p, 4K/60p oversampled, S-Log3, 10-bit | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | Phase-detect, 425 points | 759-point phase-detect, AI subject recognition (human/animal/bird/vehicle) | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | 5-axis IBIS, 6.5 stops | 5-axis IBIS, 5.0 stops | 5.5-stop IBIS |
| Burst Rate | 3fps | 11fps mechanical, 30fps electronic | 10fps mechanical |
| Battery Life | ~440 shots (CIPA) | ~570 shots (CIPA) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 900g body only | 493g body only | 699g (body, battery, card) |
| Dimensions | 150.0 × 104.2 × 87.2mm | 122.0 × 69.0 × 75.1mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | No | Yes |
| Viewfinder | EVF, 3.69M dots, 0.77× magnification | EVF, 2.36M dots | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.2" tilting touchscreen | 3.0" vari-angle touchscreen | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | Fujifilm G-mount (medium format) | Sony E-mount | Sony E-mount |
| Memory Cards | Dual SD UHS-II slots | Single SD UHS-II / CFexpress Type A slot | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | USB-C, Bluetooth, Wi-Fi | USB-C (3.2), Bluetooth, Wi-Fi | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
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