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OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds vs Sony Alpha a6400 Mirrorless Camera: Compact APS-C

Updated August 2026 — OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds wins on build quality, Sony Alpha a6400 Mirrorless Camera: Compact APS-C wins on autofocus and video capabiliti.

The OM SYSTEM Olympus OM-1 Mark II excels in durability and advanced features, while the Sony Alpha a6400 offers better affordability and video capabilities.

Why OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds is better

Durability

Weather-sealed design for extreme conditions

Autofocus

Advanced Cross Quad Pixel AF technology

Image Quality

High-resolution sensor for outdoor photography

Why Sony Alpha a6400 Mirrorless Camera: Compact APS-C is better

Price

Significantly cheaper at $835.90

Video

4K video capabilities with multiple functions

Popularity

Higher bestseller rank indicates consumer preference

Overall score

OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds
85
Sony Alpha a6400 Mirrorless Camera: Compact APS-C
90

Specifications

SpecOM SYSTEM Olympus OM-1 Mark II Micro Four ThirdsSony Alpha a6400 Mirrorless Camera: Compact APS-C
Sensor TypeBSI Live MOSExmor RS CMOS
Max ISO2560032000
Continuous Shooting10 fps11 fps
Screen TypeFixedTiltable
Weather SealingYesNo

Dimension comparison

OM SYSTEM Olympus OM-1 Mark II Micro Four ThirdsSony Alpha a6400 Mirrorless Camera: Compact APS-C

Introduction to the Competitors

In the competitive landscape of mirrorless cameras, the OM SYSTEM Olympus OM-1 Mark II and the Sony Alpha a6400 stand out for different reasons. Priced at $1,999.99, the OM-1 Mark II targets enthusiasts seeking advanced features and durability, while the a6400, costing $835.90, appeals to a broader audience with its more budget-friendly approach. This article will delve into their respective features, performance, and usability to help you determine the better option for your needs.

Image Quality

When it comes to image quality, both cameras offer impressive capabilities, but they cater to different photography styles. The OM SYSTEM Olympus OM-1 Mark II features a 20MP stacked BSI Live MOS sensor, which is designed for high-resolution images with low noise. This is particularly advantageous for outdoor photography, allowing users to capture stunning detail even in challenging conditions. The Sony Alpha a6400, on the other hand, sports a slightly higher resolution of 24.2MP with its APS-C sensor. This sensor excels in vibrant color reproduction and detail, making it an excellent choice for both stills and video.

Autofocus Performance

Autofocus capabilities can significantly influence your shooting experience, and here, both cameras shine but in different ways. The OM-1 Mark II boasts Cross Quad Pixel AF technology with 1,053 focus points, ensuring high-precision focusing across 100% of the frame. This performance is particularly beneficial for fast-paced wildlife photography. Conversely, the Sony Alpha a6400 employs a robust 425 phase-detection and 425 contrast-detection points, providing excellent tracking of moving subjects. This is especially helpful for vlogging and action shots.

Video Capabilities

For videographers, the feature sets of these two cameras are noteworthy. The OM SYSTEM Olympus OM-1 Mark II is equipped with advanced computational photography functions that enhance video capture, but it does not explicitly mention 4K video capabilities. In contrast, the Sony Alpha a6400 shines with its ability to shoot 4K video and includes multiple movie functions, allowing users to create time-lapse and slow-motion videos without the need for post-processing. This makes the a6400 a compelling choice for content creators focused on video work.

Durability and Design

Durability is a critical factor for outdoor photographers, and the OM-1 Mark II excels in this regard. It features an IP53 rating, ensuring it is dustproof, splashproof, and capable of operating in temperatures as low as -10℃. This weather-sealed design makes it an ideal companion for adventurous shooting conditions. The Sony Alpha a6400, while robust, is not specifically designed for extreme environments. It is more compact and lightweight, making it easier to carry around, but may not withstand harsh conditions as well as the OM-1 Mark II.

Usability and Ergonomics

Usability is essential, especially for those new to photography. The OM SYSTEM Olympus OM-1 Mark II offers a tactile interface with refinements that enhance usability. Its design caters to outdoor photographers, providing a comfortable grip for extended shooting sessions. The Sony Alpha a6400 features a tiltable LCD screen, making it versatile for vlogging and photography from varying angles. However, it may not be as ergonomically designed for long-term use as the OM-1 Mark II.

Price Comparison

When considering the price, the difference is significant. The OM SYSTEM Olympus OM-1 Mark II is priced at $1,999.99, while the Sony Alpha a6400 is much more accessible at $835.90, making it about 58% cheaper than the OM-1 Mark II. This price difference can be a decisive factor for many, particularly those entering the mirrorless camera market or those with budget constraints.

Popularity and Market Position

In terms of market performance, the Sony Alpha a6400 holds a bestseller rank of 5,200, indicating its popularity among consumers. This suggests that many users find it to be a reliable choice for versatile photography and videography needs. The OM SYSTEM Olympus OM-1 Mark II, while still a respected model, has a sales rank of 28,860, which may indicate a more niche audience focused on specific outdoor and high-performance capabilities.

Which should you buy?

Deciding between the OM SYSTEM Olympus OM-1 Mark II and the Sony Alpha a6400 ultimately hinges on your specific photography needs and budget. If you are an outdoor enthusiast seeking a rugged, weather-sealed camera with advanced autofocus and computational features, the OM-1 Mark II may be worth the investment at $1,999.99. However, if you prioritize versatility, video capabilities, and affordability, the Sony Alpha a6400 at $835.90 stands out as a compelling choice for a wide array of photography and videography applications.