X-A7vs Pentax K-3 Mark IIIvs A7 IV
Pentax
Pentax K-3 Mark III (2021)
From £1699
Best for DSLR enthusiasts & outdoor photographers
View Pentax K-3 Mark III
Which should you buy?
Beginner Fujifilm — X-A7 (2019): The most affordable X-mount entry — Fujifilm colour and film simulations with a large flip screen for beginners.
Dslr Enthusiasts & Outdoor Photographers — Pentax K-3 Mark III (2021): The finest APS-C DSLR ever made — class-leading weather sealing, optical viewfinder, 5-axis IBIS, and extraordinary build for photographers committed to DSLR.
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-A7 (2019)
- You want an affordable first mirrorless with decent video capabilities
- You shoot a lot of selfie-style content or vlog on a budget
- Note: no viewfinder and limited lens support — the X-T30 II is a better long-term investment
Pentax K-3 Mark III (2021)
- You're a committed DSLR photographer with significant investment in Pentax glass
- You shoot in extreme weather conditions and place build quality and reliability above everything
- You prefer optical viewfinder performance and want the best modern APS-C DSLR available
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-a7 is the most affordable; only the pentax k-3 mark iii, a7 iv are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | X-A7 (2019) | Pentax K-3 Mark III (2021) | A7 IV (2021) |
|---|---|---|---|
| Price | £399 | £1,699 | £2,299 |
| Sensor | 24.2MP APS-C CMOS (Bayer, not X-Trans) | 25.7MP APS-C BSI CMOS (AA-filterless) | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 24.2MP | 25.7MP | 33.0MP |
| Video | 4K/30p, 1080p/60p | 4K/30p, 1080p/60p | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Phase-detect + contrast, 425 points | SAFOX 13 phase-detect, 101-point (25 cross-type) | 759-point phase-detect, AI subject recognition |
| Stabilisation | None (no IBIS) | 5.5-stop 5-axis IBIS (Shake Reduction III) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 6fps | 12fps | 10fps mechanical, 30fps electronic |
| Battery Life | ~440 shots (CIPA) | 800 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 320g body only | 820g body only | 659g body only |
| Dimensions | 118.0 × 80.6 × 55.2mm | 134.5 × 103.5 × 73.5mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | No | Yes | Yes |
| Viewfinder | None | Optical pentaprism, 100% coverage, 1.05× magnification | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.5" fully articulating touchscreen | 3.2" tilting touchscreen | 3.0" vari-angle touchscreen |
| Mount | Fujifilm X-mount | Pentax KF-mount | Sony FE (full-frame E-mount) |
| Memory Cards | Single SD UHS-I slot | Dual SD UHS-II | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | USB Micro-B, Bluetooth, Wi-Fi, micro HDMI | USB-C, Wi-Fi, Bluetooth | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
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