Thank you Emilie but I think your team needs to revisit this again.
Did your team make sure to use the GX7's electronic shutter or avoid shutter speeds in the "shutter shock" zone? Or perhaps IBIS was turned on by mistake.
It could be that you simply tested a bad unit. Do you test more than one sample unit?
The Olympus 75mm F1.8 on old, 4+ year old Panasonic GH1 scored 9 "P-Mpix" but the same lens on GX7 provides only 7.
Can you explain these "P-Mpix" a bit more for us?