Anecdotally, I can't tell much of a difference between the newer phone of my girlfriend (latest iPhone) and my iPhone 13. Maybe if I nitpick on it, but for my untrained eye they all look 'good enough'.
Plus, many people who take photos on their phone will upload it to a service like instagram/discord which compresses the photos so you lose some of the quality anyway.
I have seen huge improvements in low light performance. Not worth a brand new phone, but very cool.