Upgrade Guide
Sony A7S II→Sony A7 IV
Is it worth upgrading? Spec analysis, key improvements, and our verdict.
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Worthwhile
Clear improvements over the A7S II. Whether it justifies the cost depends on which upgrades matter most to your shooting.
What's new in the A7 IV
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Resolution33MP vs 12MP (+21MP)
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Burst rate10fps mechanical, 30fps electronic vs 5fps continuous
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Battery life~580 shots (CIPA) vs ~370 shots (CIPA)
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Generation6 years newer (2021 vs 2015)
Suitability by genre
| Genre | A7S II | A7 IV | |
|---|---|---|---|
| Vlogging & Video | — | ||
| Low Light | — | ||
| Wedding | — | ||
| Portrait | — | ||
| Street | — | ||
| Sports | — | ||
| Studio Portraits | — | ||
| Outdoor Portraits | — | ||
| Wedding & Events | — | ||
| Landscape | — | ||
| Sports & Action | — |
Full spec comparison
| Spec | A7S II | A7 IV | |
|---|---|---|---|
| Price | £799 | £2,299 | |
| Released | 2015 | 2021 | ↑ |
| Sensor | 12.1MP full-frame BSI Exmor CMOS | 33MP Full-frame BSI Exmor R CMOS | |
| Resolution | 12MP | 33MP | ↑ |
| Video | 4K/30p internal (full sensor readout), 1080p/120p, S-Log2/S-Log3 | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone | |
| Autofocus | 169 phase-detect + 25 contrast AF — limited by modern standards | 759-point phase-detect, AI subject recognition | |
| Stabilisation | 5-axis IBIS — 4.5 stops (first Sony mirrorless with IBIS) | 5-axis IBIS, 5.5 stops | |
| Burst Rate | 5fps continuous | 10fps mechanical, 30fps electronic | ↑ |
| Battery Life | ~370 shots (CIPA) | ~580 shots (CIPA) | ↑ |
| Weight | 584g body only | 659g body only | ↓ |
| Weather Sealed | Yes | Yes | |
| Viewfinder | EVF, 2.36M dots, 0.71× magnification | EVF, 3.69M dots, 0.78× magnification | |
| Screen | 3.0" tilting LCD, 1.23M dots | 3.0" vari-angle touchscreen | |
| Mount | Sony FE mount (full-frame E-mount) | Sony FE (full-frame E-mount) | |
| Memory Cards | Dual SD UHS-I slots | Dual slots: CFexpress Type A + SD UHS-II |
Compare side-by-side
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