Upgrade Guide
Sony A7S III→Sony Sony FX5
Is it worth upgrading? Spec analysis, key improvements, and our verdict.
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Worthwhile
Clear improvements over the A7S III. Whether it justifies the cost depends on which upgrades matter most to your shooting.
What's new in the Sony FX5
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Resolution17MP vs 12MP (+5MP)
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Generation6 years newer (2026 vs 2020)
Suitability by genre
Base scores — computed from verified specs for an enthusiast shooting photo and video. The Upgrade Checker adjusts them for your skill level.
| Genre | A7S III | Sony FX5 | |
|---|---|---|---|
| Portrait | -0.6 | ||
| Street | -0.9 | ||
| Travel | — | ||
| Wedding & Events | -0.5 | ||
| Vlogging & Video | — | ||
| Filmmaking | +0.5 | ||
| Documentary | +0.6 | ||
| Sports & Action | -0.6 | ||
| Landscape | -0.4 | ||
| Wildlife | -0.7 | ||
| Casual | +0.2 | ||
| Food | +0.6 | ||
| Macro | -0.6 | ||
| Architecture | +0.6 | ||
| Astrophotography | -1.1 |
Full spec comparison
| Spec | A7S III | Sony FX5 | |
|---|---|---|---|
| Price | £2,999 | £4,699 | |
| Released | 2020 | 2026 | ↑ |
| Sensor | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) | 16.6MP full-frame stacked Exmor RS CMOS | |
| Resolution | 12MP | 17MP | ↑ |
| Video | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p | 5K/60p open-gate, 4K/120p, internal RAW/X-OCN, 10-bit Log, triple base ISO | |
| Autofocus | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition | AI-powered hybrid phase-detect AF (759 points) with subject tracking | |
| Stabilisation | 5.5-stop IBIS | IBIS with Dynamic Active Mode | |
| Burst Rate | 10fps mechanical | 10fps | |
| Battery Life | ~600 shots (CIPA) / ~70min continuous 4K recording | ~105 min actual recording, ~170 min continuous (LCD) | ↓ |
| Weight | 699g (with battery and card) | 734g (with battery and card) | ↓ |
| Weather Sealed | Yes | Yes | |
| Viewfinder | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made | Optional detachable EVF (DVF-EL1), OLED | |
| Screen | 3.0" vari-angle touchscreen, 1.44M dots | Fully articulating touchscreen (4-axis arm) | |
| Mount | Sony E-mount | Sony E-mount | |
| Memory Cards | Dual CFexpress Type A / SD UHS-II (both slots) | CFexpress Type A + SDXC (dual) |
Compare side-by-side
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