The Mavic Air 2S’s camera sensor is the same size as what you get in the higher-end Mavic 2 Pro. It’s much larger than the half-inch sensor used in last year’s Air 2. The Air 2S should shoot almost equally good photos and better video as the Mavic 2 Pro, at least on paper.
The Air 2S’s maximum video resolution is 5.4K, versus 4K on the Mavic 2 Pro. And the Air 2S’s 4K video even has a higher bit rate — 150Mbps compared to 100Mbps. Lastly, the Air 2S’s 4K video also has a higher frame rate. All of those are nice upgrades over what you get in the more expensive model, not to mention the benefits of the smaller Air 2.