I received my 'black' iPhone 17 yesterday. Side by side, it's clearly much lighter than my black iPhone 16. I would put it close to the colour of my Space Grey M2 Macbook Air.
It looks pretty good, although I prefer a deeper black.
Glad I stumbled onto this thread. I don't want a black phone, but may consider this rather than the "white" I usually get. I have a space grey MBP and like that color. Will need to make another visit to the Apple Store and check it out in person.