https://www.cnet.com/news/galaxy-s9-specs-versus-note-8-s8-whats-new-mwc-2018/

Samsung is smart for carrying over so much of the S8's design and specs into the S9. Our reviewer said that the S8 was the most beautiful phone ever. Though one of the biggest negatives against the phone was the location of the fingerprint reader next to the rear camera. Well, that fingerprint reader got moved to under the camera -- closer to the center of the S9's back.

The rear camera has also been improved. It has the same 13-megapixel dual-pixel sensor as the S8 and S7, but it gets a new variable aperture that can capture images at f/1.5 or f/2.4. Phone cameras traditionally can only shoot at a single aperture. So it's fascinating to see the S9 get a camera feature that the dual-rear camera Note 8 didn't have first.