Sony A7 IV vs. Sony A7 III: Is the Upgrade Worth It?

Sony’s Alpha series has long been a favorite among photographers and videographers, with the Sony A7 III cementing itself as a classic since its release in 2018. Dubbed the "basic model," it redefined expectations for a full-frame mirrorless camera at its price point. Enter the Sony A7 IV, released in late 2021, with significant upgrades and enhancements. But does the A7 IV offer enough to justify an upgrade from its predecessor?

In this detailed comparison, we’ll explore the differences between the Sony A7 IV and A7 III across critical aspects such as sensor performance, autofocus, video capabilities, and more. Whether you're a current A7 III owner or deciding which model to buy, this guide will help you make an informed choice.

1. Sensor and Image Quality

Sony A7 IV: 33MP Sensor

The A7 IV features a 33-megapixel back-illuminated Exmor R sensor, providing a significant resolution boost over the A7 III. This higher resolution allows for more detailed images and increased cropping flexibility, making it ideal for genres like landscape and studio photography.

Sony A7 III: 24MP Sensor

The A7 III is equipped with a 24-megapixel sensor, which, while lower in resolution, still delivers excellent image quality. For most users, 24MP is more than sufficient for general photography, especially for social media, printing, and professional work.

Image Quality Comparison

Dynamic Range: Both cameras offer excellent dynamic range, though the A7 IV’s newer sensor provides slightly better shadow recovery and highlight retention.
Low-Light Performance: Despite the higher resolution, the A7 IV performs admirably in low light. The A7 III’s larger individual pixel size still gives it a slight edge in extreme low-light scenarios.

Winner: The A7 IV, thanks to its higher resolution and newer sensor.

2. Autofocus System

Sony A7 IV: Enhanced Real-Time Autofocus

The A7 IV features Sony’s latest Real-Time Eye Autofocus for humans, animals, and birds, even during video recording. It boasts 759 phase-detection points, covering 94% of the image area, ensuring fast and accurate tracking even in challenging situations.

Sony A7 III: Reliable, but Older AF Technology

The A7 III has 693 phase-detection points, with Eye AF for humans only (no animal tracking). While still excellent, its autofocus technology feels dated compared to the real-time tracking advancements in the A7 IV.

Key Differences:

Animal and Bird Eye Tracking: Available on the A7 IV but absent on the A7 III.
Tracking in Video: The A7 IV provides smoother and more reliable autofocus during video recording.

Winner: The A7 IV, with its cutting-edge autofocus system.

3. Video Capabilities

Sony A7 IV: 4K 10-bit Recording

The A7 IV is a powerhouse for hybrid shooters, offering 4K 60fps (cropped to Super 35 mode) and 4K 30fps with full sensor readout in 10-bit 4:2:2 color depth. This allows for greater flexibility in post-production, especially for grading footage. It also includes S-Cinetone, a professional-grade color profile previously reserved for higher-end Sony models.

Sony A7 III: 4K 8-bit Recording

The A7 III offers 4K 30fps with full pixel readout but is limited to 8-bit 4:2:0 color. While still good for casual and even professional use, it lacks the depth and flexibility required for advanced color grading.

Other Features:

Overheating: The A7 IV has improved heat management, allowing for longer recording times compared to the A7 III.
Focus Breathing Compensation: Available on the A7 IV, this minimizes focus breathing for more cinematic video transitions.

Winner: The A7 IV, offering vastly superior video capabilities.

4. Design and Usability

Sony A7 IV: Upgraded Ergonomics

Touchscreen: Fully articulating vari-angle touchscreen, perfect for vloggers, content creators, and shooting from unconventional angles.
Menu System: Redesigned, more intuitive menu layout with touch navigation.
Build Quality: Improved grip, magnesium alloy body, and enhanced weather sealing.

Sony A7 III: Standard Ergonomics

Screen: Tilting LCD screen, which is less versatile than the A7 IV’s fully articulating display.
Menu System: Older menu system, often criticized for its complexity and lack of touchscreen navigation.

Winner: The A7 IV, thanks to improved usability and modernized design.

5. Connectivity and Storage

Sony A7 IV

Dual Card Slots: One slot supports CFexpress Type A and SD UHS-II cards, enabling faster write speeds for high-resolution files and 4K video.
Improved Connectivity: Offers USB-C 3.2, Wi-Fi 5, and Bluetooth for seamless tethering, file transfers, and remote shooting.

Sony A7 III

Dual SD Slots: Supports UHS-II for one slot, while the second is UHS-I only.
Connectivity: USB-C 3.1 and basic Wi-Fi, adequate for most use cases but less advanced than the A7 IV.

Winner: The A7 IV, with faster storage options and better connectivity.

6. Price

Sony A7 IV (click here to check current price)

Price: Around $2,500 (body only). Positioned as a high-end hybrid camera for professionals and enthusiasts.

Sony A7 III (click here to check current price)

Price: Around $1,700 (body only), making it one of the best value full-frame cameras on the market, even in 2024.

Value Analysis:

The A7 III remains an excellent option for budget-conscious buyers who don't need cutting-edge features.
The A7 IV justifies its higher price with its advanced technology, especially for hybrid shooters.

Winner: The A7 III wins for affordability, but the A7 IV offers better value for advanced users.

7. Who Should Upgrade?

Upgrade to the A7 IV if:

You need higher resolution (33MP) for detailed photography.
You shoot video professionally and require 4K 10-bit recording or advanced color profiles like S-Cinetone.
You prioritize real-time animal/bird tracking or autofocus improvements for fast-moving subjects.
You need modern ergonomics, such as the articulating screen and improved menu system.

Stick with the A7 III if:

You’re on a tight budget but still need excellent image quality and reliable performance.
Your primary focus is photography, and video is a secondary concern.
You don’t require the latest autofocus features or 10-bit video.

Conclusion: Is the Upgrade Worth It?

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The Sony A7 IV is a significant upgrade over the A7 III, offering a better sensor, superior autofocus, enhanced video capabilities, and improved usability. For professionals or hybrid shooters who demand top-tier performance, the A7 IV is well worth the investment.

However, if you already own the A7 III and primarily shoot stills or don’t need the latest video features, you may find that sticking with your current camera is a more economical choice. For newcomers, the A7 IV represents the cutting edge of what Sony’s Alpha series can do, while the A7 III remains an excellent entry point into the world of full-frame photography.

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