I'm a wierdo
... so there is no feature yet available that is tempting me to upgrade my Galaxy S8.
I'm still waiting for accurate 3D scanning and measuring, be this done via a laser Time of Flight sensor or by using two cameras, a la Project Tango. I want to wave my phone around and grab real measurements I can take back to the workshop. Qualcomm and Sony, amongst others, have been pushing this for a few years now.
The biggest Galaxy S phone, the S20 Ultra Super Duper (or whatever it is called) has a VGA-resolution ToF sensor, as does the current 12" iPad Pro - leading to fair speculation that the next iPhone will too. The very pricey and unwieldy iPad is a strange place to put a sensor that requires the device to be waived around, but as a test bed for the tech before rolling it out on the iPhone it makes sense.
I suspect the Apple system will work better than the Samsung system, given the work Apple has done on making their GPUs suitable for this sort of task.
In the meantime I'll continue searching for a tape measure. Damned things hide for a hobby. I think they're shy.
However, I'll probably wait for the tech to become more mainstream in Android before going for it, when it will likely be cheaper, better supported and more capable than Samsung's first foray into it.