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Quick take: The A1 II has the highest resolution at 50MP; the A6400 is the most affordable.
16 specs side by side·15 genres scored·UK prices from Wex Photo Video and Clifton Cameras
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A1 II — Professional Sports, Wildlife & High-Resolution Studio Work: The most complete camera ever made — 50MP, 30fps, 8K, and the world's best EVF in a single flagship body.
A6400 — Content Creation & Vlogging: The best value APS-C Sony you can buy — especially used. Real-time Eye AF at this price point was transformative when it launched and still makes it one of the most reliable autofocus systems in the lineup.
| Specification | A1 IISony · 2024 | A6400Sony · 2019 |
|---|---|---|
| Price | £5,699 | £749Best |
| Sensor | 50.1MP full-frame stacked BSI CMOS | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 50.1MPBest | 24.2MP |
| Video | 8K/30p, 4K/120p 10-bit, S-Log3 | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | AI subject recognition — human, animal, bird, insect, vehicle, aircraft, train | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | 8.5-stop IBIS (with in-lens OSS) | No stabilisation |
| Burst Rate | 30fps electronic (with full AF/AE), 10fps mechanicalBest | 11fps mechanical, 8fps with AF tracking |
| Battery Life | ~530 shots (CIPA)Best | ~410 shots (CIPA) |
| Weight | 743g (body only) | 403g (with battery and card)Best |
| Dimensions | 136.1 × 96.9 × 82.9mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.9× 9.44M-dot — the highest resolution EVF available | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.2" fully articulating touchscreen, 2.1M dots | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots |
| Mount | Sony E-mount (full-frame) | Sony E-mount |
| Memory Cards | Dual CFexpress Type A / SD UHS-II slots | Single SD UHS-I |
| Connectivity | USB-C 3.2 Gen 2, Wi-Fi 6GHz, Bluetooth 5.3, HDMI full-size | Micro-USB, Wi-Fi, Bluetooth, NFC |
Wins the row — price, resolution, burst, battery, weight and sealing are compared; text specs aren't ranked.
Scores come from the same engine as Camera Match: verified specifications weighted by what each genre needs, with documented adjustments. The product page and this table show the enthusiast base score. See how scores are calculated →