The extreme wide angle lens on my iPhone is 13mm (35mm equivalent), 2mm wider than the widest lens on the other camera systems I use. I learned many years ago that when it comes to wide angle lenses even a small amount of width is noticeable. Recently I thought I'd try out the phone in Gloucester Cathedral. The results, though deficient in a couple of ways (including being oversharpened), are better than I expected and the extra width brings more drama to the compositions.
photo © T. Boughen Camera: iPhone