Math Photographer compares Sony RX1R III vs Leica Q3 vs Fuji GFX100RF and found the Sony exceptional!

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In his latest video, The Math Photographer ran a detailed sensor comparison between four premium compact cameras: the Sony RX1R III, the Leica Q3 28 mm, the Leica Q3 43 mm, and the Fujifilm GFX100 RF.

Using a precise laboratory workflow, he tested dynamic range, noise, high-ISO behavior, and exposure recovery. All shots were captured remotely through the Sony Creators App to avoid vibration, exported as JPEGs, and analyzed with a Python script measuring four metrics — Structural Similarity Index (SSI), Mean Squared Error (MSE), Peak Signal-to-Noise Ratio (PSNR), and Average Pixel Value (APV).

Results by category:

Underexposure ranking:

Overexposure ranking:

High ISO ranking:

Conclusion: Despite being the smallest and least expensive of the group, the Sony RX1R III delivered outstanding sensor performance — often ranking second overall and first for overexposure recovery. The Leica Q3 28 mm remains a benchmark for shadow and high-ISO recovery, while the Fujifilm GFX100 RF surprisingly placed last in several categories.

The Math Photographer concludes that sensor differences among modern cameras are now marginal in real-world photography — factors like workflow, ergonomics, and brand preference matter far more. Still, the Sony RX1R III earns special praise as “a proud winner despite its size.”

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Curiosity: Sigma 14mm f/1.4 lens is a niche lens only being produced in January and February

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From minute 39 Sigma CEO Yamaki joined the podcast. Here are a couple of highlights:

  • He doesn’t work with other manufacturers, they prefer to produce lenses in their own factory
  • Sigma made no profit in past fiscal year due the increase of cost.
  • Sigma 14mm f/1.4 lens is a niche lens only being produced in January and February

The Sigma 14mm FE at BHphoto (Click here).

 

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Suspicious: Sigma 24-70mm f/2.8 DG DN II ART Lens for $899 only via third party sellers on Amazon

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SAR readers (Thanks!) spotted a massive $400 discount on the Sigma 24–70mm ART II lens on Amazon. However, note that it’s being sold by a third-party seller — so proceed with caution, as I can’t vouch for their reliability.

Back to 100% save deals: All early holiday Deals are now live on this special BHphoto page (Click here).

E-mount deals:

Storage and card deals:

Software:

 

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Sidney Diongzon: “Dear Sony Please Add THESE 3 Features to the Sony A7V”

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Sidney Diongzon would like the Sony A7V to include the following new features:

  • Audio-only recording mode with 32-bit float audio — allows recording just audio in-camera without video, useful for voiceovers and maintaining consistent sound without external recorders.
  • Larger, higher-quality 4-inch screen — similar to the Nikon ZR display, combined with Sony’s four-axis flippy-tilt mechanism, ideally OLED or using Bravia display technology for better color and brightness.
  • Built-in internal memory (64 GB–128 GB) — provides backup or emergency storage when SD cards are full or forgotten, and can be used for reference photos or videos.

I am 99,999% certain none of these will make it into the Sony A7V…but maybe on cameras coming  in 1-2 years from now this would make sense?

UPDATE: After the Canon R6III launch he posted this:

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