Re: Technical camera details - Seeking knowledge please!
There is a lot of talk about technical capabilities of different sensors, lenses, etc but in the end it comes down to the user. I have seen some absolutely horrible photos taken with the iPhone 6 and I have seen amazing photos taken with the Galaxy Nexus. Great hardware can help but I believe it is the photographer that is going to make a great photo.
As an example, a coworker purchased the iPhone 6 recently because her "Droid" (hate it when people call everything not Apple a Droid) took horribly pictures. She then showed me some new pics taken with the iPhone and they were no better.
If the people the OP is trying to recommend a phone to are half decent at taking photos - understand how to compose a shot, understand lighting and the importance of a steady hand - either the iPhone or S6 will be perfect for them. In fact, I would argue most phones will do them just fine (LG3, N6, Note 4, S5, Z3, M9, etc).
If these are people who don't know what a DSLR is, don't understand how to compose a shot I would again say either the iPhone, S6, LG3, Note 4, Z3, etc. will do them well.
You also have to look at how the photos will be shared. Are they just posting to social, emailing or are they printing large 8x10 prints? If they aren't printing large photos, pretty much every phone out there will be just fine.
All that being said, I am really excited to give the S6 camera a whirl. I am also excited it has the Camera2 API so we can use Manual Camera. That app is great on my N5.