I have the same issue. I have iPhone 14pro - my first iPhone ever. I upgraded from Pixel 3 (!!!), expecting too see a huge improvement in the picture quality, given the bigger main sensor, triple lens system, etc. Unfortunately, was I mostly got was disappointment: the moment you take a picture it looks great, and then the aggressive post-processing just turns it into garbage. Shadows are crashed and black and highlights are way off, too. No matter what picture style I use and no matter how I twist all those settings, I end up with pitch-black shadows more often than not, especially in low light. And this can’t be repaired by post-processing, because the info in shadows is just completely lost in many cases. It’s really said when you see your Pixel 3 doing a better job in low light than the top phone on the market with such a price tag.
The only workaround I found is shooting raw, then converting to jpegs and removing raws to save space - which takes time and not ideal at all. But you can get pretty decent results with RAW.
I will be returning this phone, most likely, because photo quality was the main reason I got it. RAW is great, but it looks like I just received more hassle for my money. Which is a real pity, because I like almost everything else about the phone. And it’s great to have my phone finally synced with my laptop.
Please make sure to leave product feedback on Apple website and complain about the issue. I really hope they fix it. It could have been such a great camera.
PS. in photo styles, looks like “Tone” increases or decreases contrast. I set mine at -30 and it helps a bit, but just a tiny bit. I’ll leave it here in case someone might find it useful.