Sebastiaan de With, Co-founder and designer at Lux (the studio behind the Halide Mark II camera app), has written a great review of the iPhone 12 Pro Max camera: The Pro Max was the wildcard this year ...

PERFORMANCE: Overall the Apple iPhone 12 Pro Max was excellent. It struck an exceptional balance of quickness, battery life, and camera quality. Ease of use on the iPhone 12 Pro Max was very good.