It's really not weird at all, pretty much all high end phones use sensors from Sony because they make the best sensors for this specific application. Some of the phones I know of that had the IMX377:
Nexus 5X
Nexus 6P
HTC One M10
It looks like the Pixel is using the IMX378 -- I'm not sure what differences there are between the IMX377 and IMX378.
It's also worth noting that there is a lot more that goes into a good camera system than the sensor
It looks like the Pixel is using the IMX378 -- I'm not sure what differences there are between the IMX377 and IMX378.
It's also worth noting that there is a lot more that goes into a good camera system than the sensor