People are missing the point. It isn't a swipe and then a press: it's a button to unlock (or double-tap, which on my 925 works about 1 time in 5), then a pull down, THEN a press. That's not trivial. A way to get to the camera immediately is key.
It's great that there's a hardware key on my 925, but the camera loads so PAINFULLY slow that it doesn't matter anyway.
I just tested a 640XL and the camera was really fast (like Android - iPhone fast) but there's no hardware button. So there's two motions to unlock and a button to press and the bear that was eating the cat has now disappeared into the woods))