With raise to wake, pull the phone from my pocket and one swipe one handed. Or with my dslr I can take a picture in .25 seconds. So here we go into the abyss.How often are people "racing" to launch apps? If that's what you do, then iPhone has an advantage.
I like to take random pictures. The current Samsung flagships have a hardware camera button (double tap home button). I can pull out my Note 7 and take a picture faster than any iPhone 7 user. iPhone users have to unlock, goto home screen, find camera app and launch it. No iPhone can even compare in this situation.