X-A7vs Olympus OM-D E-M5 IIIvs Pentax K-3 Mark III
OM System
Olympus OM-D E-M5 III (2019)
From £699
Best for Travel & lightweight outdoor photography
View Olympus OM-D E-M5 III
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.
Travel & Lightweight Outdoor Photography — Olympus OM-D E-M5 III (2019): The lightest weather-sealed MFT camera — compact, travel-friendly, and capable with 7.5-stop IBIS in a body that fits in a jacket pocket.
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.
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
Olympus OM-D E-M5 III (2019)
- You want a lightweight, sealed camera for travel and outdoor photography
- You're new to Micro Four Thirds and want a capable mid-range body with excellent stabilisation
- Note: consider the newer OM-5 for updated specs in a similar compact form factor
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
Quick take: The pentax k-3 mark iii has the highest resolution at 26mp; the x-a7 is the most affordable; only the olympus om-d e-m5 iii, pentax k-3 mark iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | X-A7 (2019) | Olympus OM-D E-M5 III (2019) | Pentax K-3 Mark III (2021) |
|---|---|---|---|
| Price | £399 | £699 | £1,699 |
| Sensor | 24.2MP APS-C CMOS (Bayer, not X-Trans) | 20.4MP Micro Four Thirds Live MOS | 25.7MP APS-C BSI CMOS (AA-filterless) |
| Resolution | 24.2MP | 20.4MP | 25.7MP |
| Video | 4K/30p, 1080p/60p | 4K/30p, 1080p/120p | 4K/30p, 1080p/60p |
| Autofocus | Phase-detect + contrast, 425 points | Hybrid phase/contrast AF with face/eye detection | SAFOX 13 phase-detect, 101-point (25 cross-type) |
| Stabilisation | None (no IBIS) | 7.5-stop 5-axis IBIS | 5.5-stop 5-axis IBIS (Shake Reduction III) |
| Burst Rate | 6fps | 30fps electronic / 10fps mechanical | 12fps |
| Battery Life | ~440 shots (CIPA) | 390 shots (CIPA) | 800 shots (CIPA) |
| Weight | 320g body only | 414g body only | 820g body only |
| Dimensions | 118.0 × 80.6 × 55.2mm | 125.3 × 85.2 × 49.7mm | 134.5 × 103.5 × 73.5mm |
| Weather Sealed | No | Yes | Yes |
| Viewfinder | None | 0.35" OLED EVF, 2.36M dots | Optical pentaprism, 100% coverage, 1.05× magnification |
| Screen | 3.5" fully articulating touchscreen | 3.0" fully articulating touchscreen | 3.2" tilting touchscreen |
| Mount | Fujifilm X-mount | Micro Four Thirds | Pentax KF-mount |
| Memory Cards | Single SD UHS-I slot | Single SD UHS-I | Dual SD UHS-II |
| Connectivity | USB Micro-B, Bluetooth, Wi-Fi, micro HDMI | Micro USB, Wi-Fi, Bluetooth | USB-C, Wi-Fi, Bluetooth |
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