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OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds vs Sony a7 IV Full Frame Mirrorless

Updated August 2026 — OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds wins on build quality, Sony a7 IV Full Frame Mirrorless wins on autofocus and video features.

The OM SYSTEM Olympus OM-1 Mark II offers excellent outdoor photography features at a lower price, while the Sony a7 IV excels in resolution and video capabilities.

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

Price

OM-1 Mark II is $49 cheaper than a7 IV.

Weather Sealing

OM-1 Mark II has IP53 rating for extreme conditions.

Usability

OM-1 Mark II is more approachable for beginners.

Why Sony a7 IV Full Frame Mirrorless is better

Resolution

a7 IV has a 33MP sensor compared to 20MP in OM-1 Mark II.

Video Features

a7 IV supports 4K 60p video recording.

Autofocus

a7 IV has advanced autofocus with 759 points.

Overall score

OM SYSTEM Olympus OM-1 Mark II Micro Four Thirds
85
Sony a7 IV Full Frame Mirrorless
90

Specifications

SpecOM SYSTEM Olympus OM-1 Mark II Micro Four ThirdsSony a7 IV Full Frame Mirrorless
Sensor20MP BSI33MP Exmor R
ISO Range200-25600100-204800
Continuous Shooting10 fps10 fps
Weather SealingIP53No
Video Resolution4K 30p4K 60p

Dimension comparison

OM SYSTEM Olympus OM-1 Mark II Micro Four ThirdsSony a7 IV Full Frame Mirrorless

Overview of the OM SYSTEM Olympus OM-1 Mark II and Sony a7 IV

The OM SYSTEM Olympus OM-1 Mark II is priced at $1,999.99, while the Sony a7 IV comes in at $2,049.00, making the Olympus about 2.4% cheaper than the Sony. Both cameras are designed for serious photographers, but they target slightly different markets. The OM-1 Mark II is a Micro Four Thirds system, emphasizing speed and computational photography, while the Sony a7 IV is a full-frame camera that excels in high-resolution imaging and video capabilities.

Image Quality and Sensor Technology

The image quality from both cameras is exceptional, but they utilize different sensor technologies. The OM SYSTEM Olympus OM-1 Mark II features a 20MP BSI Stacked sensor, which is designed for low noise and high resolution. In contrast, the Sony a7 IV boasts a more powerful 33MP Exmor R back-illuminated CMOS sensor, providing higher resolution and better performance in low light. The difference in megapixels could be significant for users who prioritize large prints or extensive cropping, making the Sony a7 IV the more suitable choice for those needs.

Autofocus Capabilities

Autofocus is a critical aspect of modern photography, and both cameras offer impressive systems. The OM SYSTEM Olympus OM-1 Mark II has a Cross Quad Pixel AF system with 1,053 points, ensuring high precision and responsiveness. On the other hand, the Sony a7 IV features an advanced autofocus system with 759 phase detection points, covering 94% of the frame. This results in faster and more accurate focusing, especially when tracking moving subjects. For photographers who often shoot dynamic scenes, the autofocus capabilities of the Sony may provide a distinct advantage.

Build Quality and Weather Sealing

When it comes to build quality, the OM SYSTEM Olympus OM-1 Mark II is designed for extreme conditions, featuring an IP53 rating for dustproof and splashproof performance, as well as the ability to operate in temperatures as low as -10℃. The rugged design is ideal for outdoor photographers who venture into unpredictable weather. Meanwhile, while the Sony a7 IV is a well-constructed camera, it does not emphasize weather sealing to the same extent. For those prioritizing durability in harsh environments, the Olympus model stands out.

Features for Creative Photography

Both cameras come equipped with unique features aimed at enhancing creative photography. The OM SYSTEM Olympus OM-1 Mark II excels with its computational photography functions, including Handheld High Res Shot and Live GND. These features are particularly beneficial for landscape photographers looking to capture high-quality images without the need for a tripod. The Sony a7 IV, however, offers advanced movie features like S-Cinetone and real-time Eye-AF for humans and animals, catering to videographers and those who want to capture detailed video content. Depending on your focus—still photography or videography—one camera may suit your needs better than the other.

Video Capabilities

Video functionality is another area where these two cameras diverge significantly. The Sony a7 IV supports 4K 60p video recording and offers extensive video features such as 15+ stops of dynamic range, making it an excellent option for filmmakers. It is designed to handle demanding video projects with ease, unlike the OM SYSTEM Olympus OM-1 Mark II, which does not emphasize video capabilities. If video quality and features are your top priority, the Sony a7 IV is the clear winner in this category.

User Experience and Usability

In terms of user experience, both cameras are designed with usability in mind, but they cater to different skill levels. The OM SYSTEM Olympus OM-1 Mark II emphasizes tactile usability, making it approachable for both beginners and seasoned photographers. Its computational features simplify complex shooting scenarios. The Sony a7 IV, while user-friendly, is packed with advanced features that may require a steeper learning curve. For photographers new to mirrorless systems, the Olympus may provide a more intuitive experience.

Price and Value Proposition

The OM SYSTEM Olympus OM-1 Mark II is priced at $1,999.99, while the Sony a7 IV is available for $2,049.00, representing a price difference of about $49. Although the Olympus is slightly cheaper, the value proposition depends heavily on individual needs. The Olympus offers exceptional features for outdoor photography and computational capabilities at a lower price, while the Sony a7 IV justifies its higher cost with superior resolution and advanced video features. The best choice will depend on what aspects of photography or videography are most crucial to you.

Which should you buy?

Choosing between the OM SYSTEM Olympus OM-1 Mark II and the Sony a7 IV ultimately depends on your specific needs and preferences. If you are focused on outdoor photography, value computational features, and prefer a more budget-friendly option, the Olympus could be the right choice. However, if you prioritize video capabilities, resolution, and advanced autofocus for dynamic subjects, the Sony a7 IV may be worth the additional investment. Consider your shooting style and requirements carefully to make the best decision.