We made the mistake of getting some Thinkpad X13's recently with the 1920x1080 IPS FHD 500 nit Privacy Guard screens.
BIG MISTAKE.
These monitors are HORRIBLE. The lighting is inconsistent, shadows at the bottom of the screen and on the sides. The privacy guard is a joke. Yeah, it's private, all right - you cannot see it yourself much less anyone else in the room. And if you turn the privacy guard off, the screen still is dark and has shadows even facing it directly.
The IPS screens normally have a wide viewing angle, but this supposed 'IPS screen' has ZERO viewing angle. That's right - ZERO.
Do not buy a Lenovo laptop with Privacy Guard. Just don't do it.