I can't think if any iPhone that came out and had below average quality at the time it was released. In fact iPhone cameras have generally been very high on quality, especially low light. Sure their pixel count has been average, but people want quality pictures. Don't care about pixel count. There may be certain lines, like the Lumina phones that specialized in the camera, but as far as general phones that most people have iPhones are very good quality.
A Lumina 1020 is not a standard phone. Its a niche phone.
I agree on quality (with the exception of whatever phone had problems with dropped calls), but the camera is not good in low light. It's horrible and the flash doesn't help either. Of course your definition of low light may be different from mine, but on a scale of 1-10, I'd give it a 3 in low light.
Now if you have 2 iPhones, then you can use the flash light on one to light your subject while the other one takes the picture (without the flash). It's not great, but it's acceptable.
OTOH, in good light, it's really good for a p/s jpg shooter.