Hi,
I also experience problems with the iphone 15 Pro Max camera. My wife is a beekeeper so the phone is critical for her to take pictures of the frames and later on zoom in and inspect them closer. With the iphone 13 Pro and iphone 13 pro max we could simply point and click and later on zoom in and see amazing details.
But today I helped her and took pictures with the iphone 15 Pro max and these images look terrible. You can't zoom in everythings gets blurry. This is nowhere near the iphone 13 pro quality. My wife demands now that I get rid of this %$#!& iphone 15 pro and get her the iphone 13 pro again. This is not acceptable.
I tried to play with settings (even I should not have to) and disabled macro control, lens correction, prioritize faster shooting and portraits in photo mode and it did not help at all. There is something seriously wrong with the iphone 15 pro and pro max camera.