Per Matthew Panzarino:
Per John Gruber...

https://daringfireball.net/linked/2019/09/17/panzarino-iphones-11
Oh, about that improved Face ID angle — I saw, maybe, a sliiiiiiight improvement, if any. But not that much. A few degrees? Sometimes? Hard to say. I will be interested to see what other reviewers found. Maybe my face sucks.
Per John Gruber...
I tried testing this too, and couldn’t see how the Face ID angle or distance is any more generous on the iPhones 11. It might be faster, but in terms of angles I could see no difference.
https://daringfireball.net/linked/2019/09/17/panzarino-iphones-11