Upgrade Guide

Sony A7S III→Sony Sony A9 III

Is it worth upgrading? Spec analysis, key improvements, and our verdict.

You own

Sony

A7S III

£2999

2020

→

Upgrade to

Sony

Sony A9 III

£5999 (+£3,000)

2023

✅

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 A9 III

Suitability by genre

Full spec comparison

Spec	A7S III	Sony A9 III
Price	£2,999	£5,999
Released	2020	2023	↑
Sensor	12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated)	24.6MP full-frame Exmor RS CMOS (global shutter)
Resolution	12MP	25MP	↑
Video	4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p	4K/120p, 4K/60p, 1080p/240p
Autofocus	Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition	AI subject recognition AF, 759-point phase-detect
Stabilisation	5.5-stop IBIS	8-stop IBIS
Burst Rate	10fps mechanical	120fps blackout-free electronic	↑
Battery Life	~600 shots (CIPA) / ~70min continuous 4K recording	530 shots (CIPA)	↓
Weight	699g (body, battery, card)	703g body only	↓
Weather Sealed	Yes	Yes
Viewfinder	OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made	0.64" Quad-XGA OLED EVF, 9.44M dots
Screen	3.0" vari-angle touchscreen, 1.44M dots	3.2" fully articulating touchscreen
Mount	Sony E-mount	Sony FE (E-mount)
Memory Cards	Dual CFexpress Type A / SD UHS-II (both slots)	Dual CFexpress Type A / SD UHS-II

Compare side-by-side

See A7S III and Sony A9 III next to each other with our interactive comparison tool.

Get a personalised upgrade score

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Other upgrades from the A7S III

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