Sigma 24- vs Canon RF28-
Updated July 2026 — Sigma 24- wins on price and sharpness, Canon RF28- wins on portability and durability.
The Canon RF28-70mm F2.8 is STM offers a better price and portability, while the Sigma 24-70mm F2.8 DGDN II excels in sharpness.
Why Sigma 24- is better
Image Quality
Sigma lens offers high sharpness throughout the entire image.
Optics
Sigma lens is known for outstanding optics.
Brand Reputation
Sigma is recognized for high-quality third-party lenses.
Why Canon RF28- is better
Price
Canon lens is about 17% cheaper.
Portability
Canon lens is lighter and more compact.
Durability
Canon lens has weather-resistant construction.
Overall score
Specifications
| Spec | Sigma 24- | Canon RF28- |
|---|---|---|
| Brand | Sigma | Canon |
| Focal Length | 24-70mm | 28-70mm |
| Aperture | f/2.8 | f/2.8 |
| Stabilization | No | Yes |
| Weather Resistance | No | Yes |
Dimension comparison
Pricing Comparison
The Canon RF28-70mm F2.8 is STM is about 17% cheaper than the Sigma 24-70mm F2.8 DGDN II for Sony E, priced at $1,098.95 compared to $1,319.00. When considering a purchase, price can be a significant factor, especially for photographers on a budget. While the Sigma lens offers high sharpness, the Canon lens provides a compelling combination of performance and cost-effectiveness, making it an attractive option for both amateur and professional content creators.
Brand Reputation
Both Sigma and Canon are reputable brands in the camera lens market, but they cater to different audiences. Sigma is well-known for its high-quality third-party lenses, while Canon is a leading manufacturer with a long history of producing reliable camera equipment. The choice between the two may depend on brand loyalty and previous experiences. Photographers who prefer native lenses might lean towards the Canon RF28-70mm, while those looking for outstanding optics at a competitive price may opt for the Sigma 24-70mm.
Image Quality
The Sigma 24-70mm F2.8 DGDN II is celebrated for its high sharpness throughout the entire image, an essential quality for professional photographers seeking crisp details. In contrast, the Canon RF28-70mm F2.8 is STM also boasts incredible edge-to-edge quality, supported by advanced optical designs, including two UD elements and two aspheric lenses. This means that both lenses offer excellent image quality, but the Sigma might have an edge in sharpness, making it ideal for those focused on detail-oriented work.
Features and Performance
The Canon RF28-70mm F2.8 is STM includes several modern features, such as a newly designed Image Stabilization unit, which allows for a lighter and smaller lens. This makes it a convenient everyday carry lens, perfect for capturing both stills and video. The Sigma lens, while lacking specific stabilization features, emphasizes high sharpness, which can be critical in various shooting conditions. Therefore, if portability and stabilization are priorities, the Canon lens has the advantage, whereas the Sigma excels in sharp image reproduction.
Build Quality and Durability
The build quality of the Canon RF28-70mm F2.8 is STM is notably robust; it offers weather-resistant construction equivalent to an L-series lens, making it suitable for harsh environments. While the Sigma 24-70mm F2.8 DGDN II is also designed for quality, it does not specifically mention weather resistance. For photographers who often shoot outdoors or in challenging conditions, the durability of the Canon lens could be a decisive factor.
Weight and Portability
Weighing in at just over one pound, the Canon RF28-70mm F2.8 is STM is designed to be light and compact, making it an excellent choice for photographers who need to carry their gear throughout the day. In comparison, the Sigma 24-70mm F2.8 DGDN II, while not explicitly stated, is generally heavier than its Canon counterpart. For those who prioritize portability and ease of use, the Canon lens offers a significant advantage.
Compatibility
The Sigma 24-70mm F2.8 DGDN II is specifically designed for Sony E-mount cameras, making it an excellent choice for users of that system. On the other hand, the Canon RF28-70mm F2.8 is STM is tailored for Canon mirrorless cameras. The decision of which lens to choose may ultimately depend on the camera system you own. If you are a Sony user, the Sigma lens is undoubtedly the way to go, while Canon users will find the RF28-70mm to be a perfect fit for their gear.
Which should you buy?
Ultimately, the decision between the Sigma 24-70mm F2.8 DGDN II for Sony E and the Canon RF28-70mm F2.8 is STM comes down to your specific needs and camera system. If you prioritize image sharpness and are a Sony user, the Sigma lens is an excellent investment at $1,319.00. However, if you are looking for a lightweight, durable lens with advanced features at a more budget-friendly price of $1,098.95, the Canon RF28-70mm F2.8 is STM is a compelling option. Each lens has unique strengths, so consider your shooting style and equipment before making a choice.

