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What is the benefit of an ultrasonic sensor over an optical one? Is the former even quicker to respond to input/touch?
Yes. Having used both, ultrasonic have better accuracy and much faster unlocking speed. Works better with wet fingers in my experience. Also when you unlock your phone at night, you won't be blinded by bright white light.
But it is not an absolutely essential feature. The other will get the work done in budget to midrange phones.
Yep. More accurate reading by it "feeling" your finger instead of "seeing" your finger.
Nominal upgrade but an upgrade none the less.
A lot more benefit comes from how fast the software can detect you trying to unlock your phone, waking the phone, enabling the thumbprint reader (sonic vs light), then decoding the print and finally waking to your home screen.
I love the feature that lets me open the phone to home screen from the phone being asleep. Just put your thumb on a black screen in the right spot and boom, already at the home screen.