Upgrade Guide

Sony FX3→Sony Sony A9 III

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

You own

Sony

FX3

£3799

2021

→

Upgrade to

Sony

Sony A9 III

£5999 (+£2,200)

2023

✅

Worthwhile

Clear improvements over the FX3. Whether it justifies the cost depends on which upgrades matter most to your shooting.

What's new in the Sony A9 III

↑

Resolution

25MP vs 12MP (+13MP)
↑

Stabilisation

Improved — 8-stop IBIS
↑

Burst rate

120fps blackout-free electronic vs 10fps mechanical, 10fps electronic
↑

Generation

2 years newer (2023 vs 2021)

Suitability by genre

Full spec comparison

Spec	FX3	Sony A9 III
Price	£3,799	£5,999
Released	2021	2023	↑
Sensor	12.1MP full-frame BSI Exmor R CMOS (same as A7S III)	24.6MP full-frame Exmor RS CMOS (global shutter)
Resolution	12MP	25MP	↑
Video	4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone	4K/120p, 4K/60p, 1080p/240p
Autofocus	Real-time tracking with subject recognition (human, animal)	AI subject recognition AF, 759-point phase-detect
Stabilisation	5-axis IBIS — 5 stops	8-stop IBIS
Burst Rate	10fps mechanical, 10fps electronic	120fps blackout-free electronic	↑
Battery Life	~640 shots (CIPA)	530 shots (CIPA)	↓
Weight	715g body only (with XLR handle)	703g body only	↑
Weather Sealed	Yes	Yes
Viewfinder	None — monitor/external EVF use only	0.64" Quad-XGA OLED EVF, 9.44M dots
Screen	3.0" touchscreen, fully articulating	3.2" fully articulating touchscreen
Mount	Sony FE mount (full-frame E-mount)	Sony FE (E-mount)
Memory Cards	Dual CFexpress Type A / SD UHS-II slots	Dual CFexpress Type A / SD UHS-II

Compare side-by-side

See FX3 and Sony A9 III next to each other with our interactive comparison tool.

Get a personalised upgrade score

Tell us what you shoot and we'll score the Sony A9 III against your specific genres — not just specs.

Other upgrades from the FX3

Related buying guides

Camera family history