Sony 40mm f2.5 G VS Sigma 35mm f2 DG DN Contemporary
In this blog, I will compare the Sony 40mm G f/2.5 with the Sigma 35mm f/2 DG DN Contemporary prime lens. For some people, this might seem like a strange comparison as these are two fundamentally different lenses; however, as I own both, I often wonder which one I should take for a day out. Some people might also be trying to decide which compact prime is right for them, and this blog will hopefully answer that, at least for these two models. I’ve already published detailed reviews for each lens that you can read below:
Key Similarities
Let’s start with some key similarities and features that both lenses share:
A high-quality metal build
Compact design
Balance well on big cameras (A7R)
Aperture ring
Well-damped focus ring
AF/MF switch
Fast and reliable AF
Great image quality with plenty of sharpness and nice colour rendering
Similar price points
Key Differences
There are some key differences that might impact your buying decision:
Sigma is a little bigger and noticeably heavier
Sigma can feel a little front-heavy on smaller cameras (A7C)
Sigma is faster at f/2 compared to f/2.5 of Sony
Sony has more features including a custom button and aperture de-click
Sony has better AF (Linear Motors)
Sony has a smoother firmware update process
Sony is fully weather sealed and Sigma is partially (only the mount)
Why Pick Sony Over Sigma?
The primary reason for picking the Sony over the Sigma is the 40mm focal length and the size / weight. While the difference between 35mm and 40mm isn’t that much, for some people, it’s enough to own both lenses. I would say that if 35mm feels a bit too wide, try a 40mm. If 50mm feels a bit too tight, then a 40mm might be better. The second reason would be the size and weight, especially if you’re using a smaller body such as the Sony A7C. On an A7R-style body, the difference, although apparent, won’t be as dramatic. While both lenses have great AF capabilities, the Sony is a little better given its linear motors. If having the best possible AF is a priority (no matter how small the difference), then get the Sony. The final reason would be the extra features on the Sony, such as the custom button.
Why Pick Sigma Over Sony?
The primary reason you’d go for the Sigma is the focal length. As we already discussed, for some people 40mm can be that awkward midground between 35mm and 50mm. If I had to pick one without knowing your specific requirements, it would be the 35mm. If I had to pick one focal length for the rest of my life, it would be the 35mm. The second reason you’d pick the Sigma is for the brighter f/2 aperture. If you love bokeh, want to use it for portraits, or like shooting in low light, the difference, although small, would be enough to sway your decision to the Sigma.
