As one who has gotten the latest Samsung Galaxy every year, to me, the most noticeable improvement with the S26Ultra has been the great improvement in the speed of facial recognition.
Coming from an iPhone, I can't compare directly to previous Samsung's, but it's definitely fast. I have mine set up for both facial recognition and fingerprint Id and it unlocks and goes to my home page before I even get a chance to put my thumb on the sensor lol!
I couldn't get it to work it registered 100% And then it just never worked. Maybe cuz I got a Zagg screen protector on or I wasn't doing something right I don't know. I did try to erase it and redo it and I couldn't get my face angled just right and it wasn't registering and I just gave up. I don't usually use face but I wanted to try it.