Most of the time I take photos on my iphone as it's handy and I can capture a quick moment and easily e-mail and share with family. However, the quality is very dependent on enough light. I find that when I'm taking photos for recipeyum and mykidcraft that it's not great in the evening.
As a professional photographer I mostly use all my very expensive photo equipment, but I do still use the iPhone sometimes. Usually for person snap shots and pics of my cat. I also have an digital compact that I carry for those times when you have the camera all set up for a long exposure with filters attached and stuff, and then sometime quickly comes into view and you need to snap in a hurry.
I mostly use my iPhone to snap pics as it's easier to upload to social media sites. However, when I carry my camera out when travelling overseas or when I know I'm heading out for a big gathering. The camera seldom fails me, especially in low-light conditions, and the quality is definitely better than the pics taken with the phone.
Every year I attend a luncheon with old friends to celebrate Christmas. We all have grandchildren now and always swap photos of those kids. The last couple of years there wasn't a lot of photographs swapped as we had to chose between eating and drinking OR manipulating phones, dropping them, trying to enlarge the screen……because everyone of us only had the photo on our phones. Challenging.
I got a new card for my camera, took it away on our last holiday recently for a month, but I only used my iPhone S3 camera. I have 2,000 photos on there now, & our young granddaughters love taking selfies on it, esp' the older 1! My husband uses his iPhone S3 camera as well as his new Go-Pro.