Compared with M43 - 17.3 mm × 13.0 mm (21.6 mm diagonal)I expect everyone knows that 1-inch sensors are considerably smaller than 1 inch.
https://www.cined.com/the-truth-about-1-inch-sensors-they-are-smaller-than-you-might-think/
A 1-inch sensor has a 16 mm diagonal (13.2 mm x 8.8 mm)
An APS-C sensor has a 27 mm diagonal (22.3 mm x 14.9 mm)
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