"iPhone killer Pixel 3"
I think that idea is wrong in that it assumes that there is a significant crossover between Android and iPhone owners and buyers. The market looks to me far more rigidly segmented.
Android users make the choice between keeping their existing phone, upgrading to the makers newer offering, or changing to a different Android maker's product
iPhone users choose between keeping their existing iPhone or buying a newer iPhone.
I doubt many existing users change between platforms and new users are influenced by peer pressure, family, and gender.