Nokia 8.1 has a double channel LPDDR4X type of 4GB RAM.
Yes, Nokia 8.1 does have the Corning Gorilla Glass display.
Yes, Nokia 8.1 does support Qualcomm Quick Charge. It also comes with 18W fast charger.
Yes, you can use 2 4G SIM cards at the same time in Nokia 8.1.
Yes, Nokia 8.1 is the metal body phone.