Looks like the new Osmo has a major improvement in low light. Whats actually the sensor size of the 2 cams?

I googled it for you.
Hero 9 Black 1/2.3in sensor - Dimensions: approx. 6.3 x 4.7mm
Pocket 2 1/1.7-Inch sensor - Dimensions: approx. 7.6 x 5.7mm

Hello 777, thank you for reaching us out and I appreciate your inquiry. The sensor size of the Osmo Pocket 2 camera is 1/1.7" CMOS. You can refer to this link for the technical specifications of the Osmo Pocket 2. https://www.dji.com/pocket-2/specs below is the screenshot coming from the specs page. I hope you find the information helpful. Thank you.