This all really depends on how you transferred the pictures. Some methods, like many email systems, strip the metadata from the transferred picture to preserve the privacy of the sender. Transferring through computers or web sites or off-site storage can also alter the metadata, and even modify the resolution and size of the picture file.
Using the iPhone "Share" routine, a sender can choose "Options"

that will let them remove certain metadata before the picture is transferred.
I usually turn everything on and use AirDrop. What are you guys doing, exactly?