It might be worth mentioning, that it's not Face ID 2
Apple didn't call it second gen face ID, nor do they advertise it as such. They always advertise "second gen ____" when they can, such as the butterfly keyboards or Touch ID, but there's a reason they just say its faster and not the second gen version of it.
Comparing it on my XS to my X (on iOS 12) its pretty much identical in speed. Theres a bunch of youtube videos that compare it, and its maybe a milisecond or two faster on the XS/Max devices but its not really much faster
Further, the actual Face ID tech is the same as last year's, and hasn't been updated. What they did say, is its faster because of the new neural engine algorithms and the new secure enclave, but not because its any new faster technology the way Touch ID on the 6s was the second gen version of the 5s/6 sensor.
This is just for clarification, because I think next year they will say "second gen face ID" and people might become confused.
Face ID is perfectly fine on iOS 12 though.
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For the test, you have to do them individually and record the times because of the way Face ID works you can't do a proper side by side comparison. If you do side by side, you'll notice the X will open faster sometimes because of which phone you look at first - try it again independently and you'll see the same thing I can see, or every youtube video thats as compared them shows...the difference is maybe half a second at best but its really very similar. Yes the XS is faster...but not by 1-2 seconds...maybe a few milliseconds to half a second.
iOS 12 really sped up Face ID on the X
https://beebom.com/face-id-ios-12-faster/