Upgrade Guide

Sony A6400→Sony A7R III

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

You own

Sony

A6400

£899

2019

→

Upgrade to

Sony

A7R III

£1799 (+£900)

2017

✅

Worthwhile

Clear improvements over the A6400. Whether it justifies the cost depends on which upgrades matter most to your shooting.

What's new in the A7R III

Suitability by genre

Full spec comparison

Spec	A6400	A7R III
Price	£899	£1,799
Released	2019	2017	↓
Sensor	24.2MP APS-C Exmor CMOS BSI	42.4MP full-frame BSI Exmor R CMOS
Resolution	24MP	42MP	↑
Video	4K/30p (6K oversampled, no crop), 1080p/120p slow-motion	4K/30p (full-frame readout), 1080p/120p
Autofocus	Phase-detect, 425 points, real-time Eye AF & animal AF	399 phase-detect + 425 contrast AF points — real-time Eye AF
Stabilisation	None (no IBIS)	5-axis IBIS — 5.5 stops
Burst Rate	11fps mechanical, 8fps with AF tracking	10fps with AF/AE tracking	↓
Battery Life	~410 shots (CIPA)	~650 shots (CIPA)	↑
Weight	403g (body, battery, card)	650g body only	↓
Weather Sealed	No	Yes	↑
Viewfinder	EVF, 2.36M dots, 0.70× magnification	EVF, 3.69M dots, 0.78× magnification
Screen	3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots	3.0" touchscreen, tilting
Mount	Sony E-mount	Sony FE mount (full-frame E-mount)
Memory Cards	Single SD UHS-I	Dual SD slots (one UHS-II)

Compare side-by-side

See A6400 and A7R 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 A7R III against your specific genres — not just specs.

Other upgrades from the A6400

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Camera family history