Again, very little knowledge about audio, but some knowledge about photography..

From what I have read, it is important to have a physically large condenser/diphragm for a mic to have high fidelity. Could you educate me a bit please?

At least for photography, I can tell you with certainty, an iphone camera is basically a toy when you are talking of challenging scenes being put on large fine art prints. It is nowhere near creating same "fidelity" images as even a micro 4/3rd camera, and there are medium format digital cameras out there.