Here’s the upshot:
The camera performed very well in our tests in pretty much all areas, but some challenges remain. Still images generally show very good exposure. Dynamic range is very wide in bright light and under indoor conditions, but some highlight clipping is still visible in very difficult scenes. Overall, the iPhone is among the very best for exposure; it’s only in very low light when can’t keep up with devices with larger image sensors, such as the Huawei Mate 30 Pro. Like previous iPhone generations, the 11 Pro Max also scores very well for color and is among the best in this category in all light conditions. A slightly greenish cast is visible in some indoor scenes and in our lab tests, but overall color tends to be very pleasant: a slight yellow cast gives some scenes a warm feel and works very well for skin tones in portraits.
Overall, an excellent review. The iPhone 11 Pro Max got a 124 as a photo score, compared to the second best iPhone, the XS Max, which got a 110.
DXOMARK has the iPhone 11 Pro Max third, behind both the Huawei Mate 30 Pro and the Xiaomi Mi CC9 Pro Premium Edition.
Read the review. There’s a lot of detail here, lots of images to bring home specific points.