Sony 100-400mm GM vs Sigma 100-400mm - Image Quality Comparison
Introduction
How much of an image quality difference is there between the Sony 100-400mm G Master lens and the Sigma 100-400mm Contemporary lens?
To find out, I compared a series of real-world landscape images captured side by side with both lenses on the 61 megapixel Sony A7R V to evaluate sharpness, detail, and overall image quality across multiple focal lengths. While the Sony 100-400mm G Master costs significantly more than the Sigma 100-400mm, this comparison looks at whether the added cost translates into noticeably better image quality for landscape photography.
For this comparison, all images were captured in RAW format and imported into Lightroom using Adobe’s default settings with lens corrections enabled. Images were captured primarily at f/8-f/9, and compared across 100mm, 135mm, 200mm, 300mm, and 400mm focal lengths using real-world landscape scenes rather than lab testing. The goal was not to create a comprehensive lens review, but rather provide practical side-by-side image quality comparisons to help photographers evaluate which lens may best suit their needs.
Watch the Full Comparison
Watch the full side-by-side comparison below, including real-world landscape examples and detailed sharpness observations across multiple focal lengths.
Key Takeaways
Overall Sharpness: Across much of the focal range, the Sony 100-400mm G Master produced noticeably sharper images with better fine detail rendering compared to the Sigma 100-400mm Contemporary. The difference was especially visible when zooming into fine textures, distant trees, rocks, and high-detail landscape scenes.
100mm & 135mm Performance: At shorter focal lengths, the Sony G Master showed a clear sharpness advantage, producing crisper detail and better clarity across the frame, particularly when viewed at 100% or greater magnification.
200mm Performance: At 200mm, both lenses performed surprisingly similarly, with only minimal differences in center sharpness. In some edge areas, the Sigma lens even appeared slightly better in certain examples.
300mm & 400mm Performance: At longer focal lengths, the Sony G Master again pulled ahead with stronger sharpness and better detail retention, especially in fine textures and edge performance. The Sigma remained very usable, but appeared softer overall.
Color Rendering: One minor difference I noticed was a color shift between the two lenses. The Sigma tended to render warmer tones, while the Sony G Master appeared slightly cooler, despite both being shot at identical manual Kelvin settings. In practice, this difference is easy to correct during editing.
Bottom Line: The Sony 100-400mm G Master delivered higher image quality overall, though the Sigma 100-400mm still produced respectable results given its much lower price point. Whether the Sony is worth the additional cost depends largely on how much you value maximum sharpness, large prints, or pixel-level image quality.
RAW Files
Download the original RAW files from this comparison to inspect the images yourself, test your own editing workflow, and evaluate sharpness in Lightroom, Photoshop, or your preferred RAW editor.
Check Current Pricing
Check current pricing and availability below:
Sony 100-400mm GM
View at B&H Photo | View at Amazon
Sigma 100-400mm Contemporary (Sony E)
View at B&H Photo | View at Amazon
Sony A7R V
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