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OM SYSTEM OM-5 Mark II Body Black Compact Light vs Sony Alpha a6400 Mirrorless Camera: Compact APS-C

Updated August 2026 — OM SYSTEM OM-5 Mark II Body Black Compact Light wins on portability and durability, Sony Alpha a6400 Mirrorless Camera: Compact APS-C wins on autofocus and user features.

The OM SYSTEM OM-5 Mark II excels in outdoor capabilities and weather sealing, while the Sony Alpha a6400 offers superior autofocus and affordability.

Why OM SYSTEM OM-5 Mark II Body Black Compact Light is better

Weather Sealing

OM-5 Mark II is weather-sealed for outdoor use.

Unlimited Video

OM-5 Mark II offers unlimited 4K video recording.

Image Quality

OM-5 Mark II provides unmatched image clarity.

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

Price

Sony Alpha a6400 is significantly cheaper.

Autofocus

Alpha a6400 has superior autofocus performance.

Sales Rank

Alpha a6400 has a higher sales rank.

Overall score

OM SYSTEM OM-5 Mark II Body Black Compact Light
78
Sony Alpha a6400 Mirrorless Camera: Compact APS-C
85

Specifications

SpecOM SYSTEM OM-5 Mark II Body Black Compact LightSony Alpha a6400 Mirrorless Camera: Compact APS-C
SensorMicro Four ThirdsAPS-C
MP20.424.2
Video Quality4K4K
Battery Life300410
ScreenFixedTiltable

Dimension comparison

OM SYSTEM OM-5 Mark II Body Black Compact LightSony Alpha a6400 Mirrorless Camera: Compact APS-C

Price Comparison

The OM SYSTEM OM-5 Mark II is priced at $1,199.99, while the Sony Alpha a6400 comes in at $835.90, making it about 30% cheaper than the OM-5 Mark II. This substantial price difference could be a deciding factor for budget-conscious photographers. While the OM-5 Mark II offers features tailored for outdoor adventures, the Sony Alpha a6400 provides excellent value for those looking for a versatile mirrorless camera without breaking the bank.

Design and Build Quality

Both cameras are designed to be compact and lightweight, but the OM SYSTEM OM-5 Mark II stands out with its weather-sealed body, making it ideal for outdoor use. Weighing just 370 grams, this camera is built for adventurers who may face unpredictable weather conditions during their travels. In contrast, the Sony Alpha a6400 is equally portable but lacks the same level of weather resistance. While both cameras are easy to carry, the rugged design of the OM-5 Mark II is specifically tailored for outdoor enthusiasts.

Image Quality

When it comes to image quality, the OM SYSTEM OM-5 Mark II boasts unmatched image clarity with its advanced computational photography capabilities. This camera is engineered for sharp, stable, and vibrant shots, making it an excellent choice for capturing stunning landscapes. On the other hand, the Sony Alpha a6400 features a 20.1MP stacked back illuminated Exmor RS CMOS sensor, which delivers exceptional image quality with natural colors. While both cameras perform well, the OM-5 Mark II is more focused on outdoor photography where lighting conditions can vary significantly.

Autofocus Performance

The autofocus performance of the Sony Alpha a6400 is particularly impressive, offering 425 phase and 425 contrast detection points that cover 84% of the sensor. This allows for fast and accurate focusing, especially in dynamic shooting situations. The OM-5 Mark II, while also equipped with high autofocus capabilities, does not specify the number of focus points, making it somewhat less clear how it compares in this regard. For those who prioritize quick and precise focus, the Alpha a6400 may hold an advantage.

Video Capabilities

Both the OM SYSTEM OM-5 Mark II and the Sony Alpha a6400 excel in 4K video recording, but they cater to slightly different audiences. The OM-5 Mark II offers unlimited 4K video recording, making it an excellent choice for storytellers who want to capture longer sequences without interruption. Conversely, the Alpha a6400 is designed for versatility, featuring multiple movie functions that allow users to create time-lapse and slow-motion videos easily. Depending on your specific video needs, either camera could be a strong contender.

User Interface and Controls

The Sony Alpha a6400 includes a tiltable LCD screen, allowing for easy vlogging and innovative angles during photography. This feature can be particularly beneficial for content creators who require flexibility in their shooting positions. Meanwhile, the OM SYSTEM OM-5 Mark II does not highlight a tiltable screen, focusing instead on its outdoor-friendly features. If a flexible user interface is vital for your shooting style, the Alpha a6400 may offer a more accommodating experience.

Brand Reputation and Sales Rank

In terms of brand reputation, both OM SYSTEM and Sony are respected names in the photography industry. The OM-5 Mark II has a sales rank of 30,336, suggesting it is gaining traction among outdoor photography enthusiasts. In contrast, the Sony Alpha a6400 has a significantly higher sales rank of 5,200, indicating its popularity and reliability among general consumers. A higher sales rank often reflects positive user feedback and a strong market presence, which can be an essential consideration for potential buyers.

Which should you buy?

Choosing between the OM SYSTEM OM-5 Mark II and the Sony Alpha a6400 ultimately comes down to your specific photography needs and budget. If you prioritize outdoor capabilities, weather sealing, and unlimited 4K video, the OM-5 Mark II could be the better choice, albeit at a higher price. Conversely, if you are looking for a more affordable option that excels in autofocus performance and offers versatile video functions, the Sony Alpha a6400 stands out. Both cameras have their unique strengths, making them suitable for different types of photographers.