Biological differences will get different fail rates too. Due to my job I have to wash my hands with alcohol often it makes the finger kind of dry.Well I'm living in Mediterranean and even in winter average temperature is 15 degree C so I don't have any issues.
To me it's very reliable even few days temperature drop to 9-10 degree C and with cold hand didn't have any issue.
Only time had issue was July and August with temperature 35 degree C but again those period fingerprint sensor wasn't optimazed as it is from September and after.
To me 9 to 10 attempts is totally successful with one attempt so fingerprint sensor to me is reliable with very high level.
But again I believe ultrasonic sensor by Qualcomm will eliminate any kind issue optical sensor has now.
But keep in mind it's much more expensive than optical sensor even Samsung will use ultrasonic only at S10+ not the regular S10 version.
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Anyway the fingerprint scanner is not acceptable too me.
Sometimes I wonder if the the NEX A would had been a better purchase I guess it would have even better battery life, and in real world performance I would probably not notice a difference. Anyway not many phones are perfect.. it stood between this one and note 9, and in the end it did come to price difference.
Most disappointing thing is that not many people seem impressed with the pop up camera, only the really nerdy people regular people are too stupid to realize what is happening and also realize the purpose of it, they dont even notice it has no notch at the top you know. Times have changes and we have come to a time where people seemply dont care what other people have as smartphone, we have taked for granted that all people have the latest and greatest so people don't put attention to it.
My Previous phone was the Mi MIX 1 and that phone did actually made people give me looks and I was noticeable but with this device no...
So the times when you can brag about a phone is over. At the same time it is kind of intersting times in the smartphone word thanks to the innovation storm from china. But we have also taken a lot of stuff for granted today which make smartphones more boring too.
I still remember the feeling I got with my first smartphone Samsung Note, it really felt revolutionary, and the video camera felt really good, now we take it for granted. Not one single person have asked what Phone I have, you have to ask people to put the phone side to side to notice the difference between theirs then they notice the screen to body ratio.