The iPhone has the best picture-taking experience of every phone I've used - though it's a combination of having a great lens, great sensor, great screen to display pictures on, and a great processor to reduce latency and startup times. All of the other phones tend to get something wrong. (Disclaimer: I still haven't used a Windows Phone handset yet).
When I use the camera on my Lumia920 I never consider things like that. I guess that means either that I'm totally clueless (very possible) or that the Nokia 'just works'.