EOS R6 Mark IIvs Sigma fpvs A6400
Sigma
Sigma fp (2019)
From £1499
Best for Creative filmmakers & experimental photographers
View Sigma fp
Which should you buy?
Portraits & Action — EOS R6 Mark II (2022): 40fps burst, 8-stop IBIS, and Canon's best-in-class Dual Pixel AF — exceptional for action, sports, and portrait work.
Creative Filmmakers & Experimental Photographers — Sigma fp (2019): The smallest full-frame camera in the world — Cinema DNG RAW and L-mount flexibility in a pocket-sized body that rewards creative shooters.
Content Creation & Vlogging — A6400 (2019): 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.
Who should buy what
EOS R6 Mark II (2022)
- You want a do-everything full-frame body for weddings and events
- You need reliable subject tracking across stills and fast-moving video
- You shoot both photos and video professionally and need a single body that handles both
- You want Canon's colour science with a modern mirrorless system
Sigma fp (2019)
- You're a filmmaker building a cinema rig where the smallest full-frame body is essential
- You want L-mount compatibility to pair with Sigma Art or Leica SL lenses
- You prioritise video and cinema colour over stills ergonomics and functionality
A6400 (2019)
- Vloggers and content creators who need a flip screen and reliable AF
- Photographers upgrading from a compact or smartphone
- Beginners who want room to grow into a full E-mount lens ecosystem
- Anyone prioritising autofocus performance at an accessible price
Quick take: The sigma fp has the highest resolution at 25mp; the a6400 is the most affordable; only the eos r6 mark ii is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R6 Mark II (2022) | Sigma fp (2019) | A6400 (2019) |
|---|---|---|---|
| Price | £2,099 | £1,499 | £899 |
| Sensor | 24.2MP Full-frame BSI CMOS | 24.6MP full-frame Bayer CMOS | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 24.2MP | 24.6MP | 24.2MP |
| Video | 4K/60p 10-bit oversampled, 6K RAW out, FHD/180p | 12-bit Cinema DNG RAW, 4K/24p, 1080p/120p | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | Dual Pixel CMOS AF II, 6072 zones, deep-learning subject tracking | Contrast-detect AF with face/eye detection | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | 5-axis IBIS, 8.0 stops (coordinated with IS lenses) | None (lens-based only) | None (no IBIS) |
| Burst Rate | 12fps mechanical, 40fps electronic | 18fps electronic | 11fps mechanical, 8fps with AF tracking |
| Battery Life | ~760 shots (CIPA) | 200 shots (CIPA) | ~410 shots (CIPA) |
| Weight | 670g body only | 422g body only | 403g (body, battery, card) |
| Dimensions | 138.4 × 98.4 × 88.4mm | 112.6 × 69.9 × 45.3mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | Yes | No | No |
| Viewfinder | EVF, 3.69M dots, 0.76× magnification | None | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.15" fixed touchscreen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots |
| Mount | Canon RF mount (full-frame) | Leica L-mount | Sony E-mount |
| Memory Cards | Dual SD UHS-II slots | Single SD UHS-II + CFexpress Type B (via adapter) | Single SD UHS-I |
| Connectivity | USB-C 3.1, Bluetooth, Wi-Fi | USB-C 3.1, Wi-Fi, Bluetooth | Micro-USB, Wi-Fi, Bluetooth, NFC |
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