The Apple iPhone 11 Pro Max selfie camera placed in the Top 10 in DxOMarks charts, even if just barely. Its a solid 9 points up on its predecessor, the XS Max, and a point shy of matching the Pixel 4.
The lens of the front-facing camera on the iPhone 11 family is wider than that of the XS phones, which helped. Also, the new SL 3D camera performs well when it comes to rendering bokeh in portrait shots.
Where the camera falls short is noise and low-light performance. In fact, the low light tests is where the phone lost the most points.
The iPhone 11 Pro Max is fairly unique as its capable of recording 2160p/60fps video with its selfie camera and capturing 1080p/120fps slow-mo footage. Add to that a capable gyro-based EIS and a competent video HDR implementation and the phone goes into the Top 5 with a video score of 90.
Ultimately, the iPhone 11 phones (all three use the same hardware for the selfie cam) is a marked improvement over the XS generation. But if the selfie camera is a priority, you could do better than iPhone.