Upgrade Guide

Sony A7 IV→Sony FX3

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

You own

Sony

A7 IV

£2299

2021

→

Upgrade to

Sony

FX3

£3799 (+£1,500)

2021

❌

Skip it

The FX3 offers little measurable spec improvement over the A7 IV. Spend the money on glass instead.

Unchanged or similar

Suitability by genre

Full spec comparison

Spec	A7 IV	FX3
Price	£2,299	£3,799
Released	2021	2021
Sensor	33MP Full-frame BSI Exmor R CMOS	12.1MP full-frame BSI Exmor R CMOS (same as A7S III)
Resolution	33MP	12MP	↓
Video	4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone	4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone
Autofocus	759-point phase-detect, AI subject recognition	Real-time tracking with subject recognition (human, animal)
Stabilisation	5-axis IBIS, 5.5 stops	5-axis IBIS — 5 stops
Burst Rate	10fps mechanical, 30fps electronic	10fps mechanical, 10fps electronic
Battery Life	~580 shots (CIPA)	~640 shots (CIPA)	↑
Weight	659g body only	715g body only (with XLR handle)	↓
Weather Sealed	Yes	Yes
Viewfinder	EVF, 3.69M dots, 0.78× magnification	None — monitor/external EVF use only
Screen	3.0" vari-angle touchscreen	3.0" touchscreen, fully articulating
Mount	Sony FE (full-frame E-mount)	Sony FE mount (full-frame E-mount)
Memory Cards	Dual slots: CFexpress Type A + SD UHS-II	Dual CFexpress Type A / SD UHS-II slots

Compare side-by-side

See A7 IV and FX3 next to each other with our interactive comparison tool.

Get a personalised upgrade score

Tell us what you shoot and we'll score the FX3 against your specific genres — not just specs.

Other upgrades from the A7 IV

Related buying guides

Camera family history