>>Get them on something bigger though? Look a little closer? Use decent resolution monitor? A reasonable sized print? They look bad.

So I don't have an iPhone, but I do currently have in my home office two pictures taken with my OnePlus 5T, both printed on A3 size paper and framed, hanging on my walls. They look absolutely perfectly sharp and I'm constantly impressed that something so good came out of a smartphone.

Here's one of the pictures itself: https://drive.google.com/open?id=1iVenWHP4TesmhTWAY2qMDQs21u...

Here's how it looks printed: https://drive.google.com/open?id=1h6P5ZbNjQ5FD9nkzdB_TnfsA4l...