The cameras are a big step from the P20 series and even the Mate 20 line and I like how they are still using mechanical methods for low light rather than software.
Other than that there's not much of a differentiation. No real world experiences on the in screen finger sensor, loss of IR for face unlock (compared to Mate, which means it's the same as the P20 series) and the curved display has more potential downsides than upsides for those that use a case.
Also I'm not a fan of how the smaller/better ergonomically fitting P30 has lesser hardware. I'd rather have the P30 form factor with all the goodies of the Pro model. Just have two sizes of the same hardware.