[sk5t]

Nooope, it's not even close--the iPhone is slow, inflexible, and poor-performing compared to a pro DSLR hooked to a 24-70 f/2.8 or 70-200 f/2.8 zoom. Consumer DSLRs are kind of pokey, but the pro models go from "off" to "shoot" in a fraction of a second, with no perceptible delay between hitting the shutter button and an exposure. There is no faffing about with P mode or the like (only someone who doesn't know how to use his camera would be caught out doing this).

The iPhone does have an advantage in network connectivity, but it's comparatively unlikely to capture the couple of moments worth saving.