When you swipe up there is a split second delay before it gets to the home screen. Note in the below example the unlock was at a perfect distance. If you take it from odd angles, the delay increases. I can bet a year's salary that on the next year's iPhone that small delay will vanish and it will be as fast as the TouchID phone on the left
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Hey if that’s a valid enough reason for you to wait another year good for you man. To me its trivial. Faceid is leagues above Touch ID in my opinion. So for me it was the perfect upgrade from the 6.