Upgrade Guide

Sony A7S II→Sony A6400

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

You own

Sony

A7S II

£799

2015

→

Upgrade to

Sony

A6400

£899 (+£100)

2019

✅

Strong upgrade

The A6400 improves across 3 key areas at a reasonable price gap. Most A7S II owners will notice the difference.

What's new in the A6400

Unchanged or similar

Suitability by genre

Full spec comparison

Spec	A7S II	A6400
Price	£799	£899
Released	2015	2019	↑
Sensor	12.1MP full-frame BSI Exmor CMOS	24.2MP APS-C Exmor CMOS BSI
Resolution	12MP	24MP	↑
Video	4K/30p internal (full sensor readout), 1080p/120p, S-Log2/S-Log3	4K/30p (6K oversampled, no crop), 1080p/120p slow-motion
Autofocus	169 phase-detect + 25 contrast AF — limited by modern standards	Phase-detect, 425 points, real-time Eye AF & animal AF
Stabilisation	5-axis IBIS — 4.5 stops (first Sony mirrorless with IBIS)	None (no IBIS)
Burst Rate	5fps continuous	11fps mechanical, 8fps with AF tracking	↑
Battery Life	~370 shots (CIPA)	~410 shots (CIPA)	↑
Weight	584g body only	403g (body, battery, card)	↑
Weather Sealed	Yes	No	↓
Viewfinder	EVF, 2.36M dots, 0.71× magnification	EVF, 2.36M dots, 0.70× magnification
Screen	3.0" tilting LCD, 1.23M dots	3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots
Mount	Sony FE mount (full-frame E-mount)	Sony E-mount
Memory Cards	Dual SD UHS-I slots	Single SD UHS-I

Compare side-by-side

See A7S II and A6400 next to each other with our interactive comparison tool.

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