I picked up the 8pro. The fingerprint reader is fine, maybe marginally improved over the 7pro. It's nowhere near the ultrasonic fingerprint readers. But, it now has Class 3 secure face unlock, which is good enough for banking and other apps, and combined with the fingerprint reader, it's pretty quick to unlock.
It could be better, but it's not as horrible as the reviews told me it was. Moved from a Z Fold 4 to an 8 pro - I've never ultrasonic, so take my opinion with a grain of salt.
The real star of the show is the Level 3 Face Unlock. It works perfectly as long as you're in a lit room