X-S20vs Sigma fpvs A7 IV
Sigma
Sigma fp (2019)
From £1499
Best for Creative filmmakers & experimental photographers
View Sigma fp
Which should you buy?
Hybrid Photo & Video — X-S20 (2023): Fujifilm's most accessible X-series body — 7-stop IBIS, 6K video, 20 film simulations, and a user-friendly layout.
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.
Portrait & Wedding Photography — A7 IV (2021): The full-frame portrait benchmark — 33MP, AI Eye AF, and exceptional skin-tone rendering in a pro-grade hybrid body.
Who should buy what
X-S20 (2023)
- You primarily create video content and want a capable but compact Fujifilm
- You're a vlogger, travel creator, or documentary shooter
- You want Fujifilm film simulations with strong, reliable video specs
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
A7 IV (2021)
- You want a high-resolution full-frame all-rounder for portraits, weddings, or travel
- You're stepping up from APS-C or a DSLR and want the best all-round full-frame body under £3,000
- You shoot a mix of stills and video and need a single body that handles both seriously
- You want access to the widest lens ecosystem in the mirrorless market
Quick take: The a7 iv has the highest resolution at 33mp; the x-s20 is the most affordable; only the a7 iv is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | X-S20 (2023) | Sigma fp (2019) | A7 IV (2021) |
|---|---|---|---|
| Price | £849 | £1,499 | £2,299 |
| Sensor | 26.1MP APS-C X-Trans CMOS 4 | 24.6MP full-frame Bayer CMOS | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 26.1MP | 24.6MP | 33.0MP |
| Video | 6.2K/30p, 4K/60p, F-Log2, 10-bit | 12-bit Cinema DNG RAW, 4K/24p, 1080p/120p | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Phase-detect, 425 points, subject tracking | Contrast-detect AF with face/eye detection | 759-point phase-detect, AI subject recognition |
| Stabilisation | 5-axis IBIS, 7.0 stops | None (lens-based only) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 8fps mechanical, 20fps electronic | 18fps electronic | 10fps mechanical, 30fps electronic |
| Battery Life | ~750 shots (CIPA) | 200 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 491g body only | 422g body only | 659g body only |
| Dimensions | 126.0 × 85.1 × 65.4mm | 112.6 × 69.9 × 45.3mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | No | No | Yes |
| Viewfinder | EVF, 2.36M dots, 0.62× magnification | None | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.15" fixed touchscreen | 3.0" vari-angle touchscreen |
| Mount | Fujifilm X-mount | Leica L-mount | Sony FE (full-frame E-mount) |
| Memory Cards | Single SD UHS-I slot | Single SD UHS-II + CFexpress Type B (via adapter) | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | USB-C 3.2, Bluetooth, Wi-Fi | USB-C 3.1, Wi-Fi, Bluetooth | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
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