From the airbus web site
Maximum ramp weight 562 tonnes
Maximum takeoff weight 560 tonnes
Maximum landing weight 386 tonnes
Maximum zero fuel weight 361 tonnes
Maximum fuel capacity 310,000 Litres
Typical operating weight empty 276.8 tonnes
Typical volumetric payload 66.4 tonnes
850 pax config?
I don't know the international standard for average weight of pax for weight and balance purposes. But I seem to remember 77KGs as a figure + luggage would give avaerage weight per pax at about 105 KGs plus.
850 PAX would be very close to 90 tonnes or probably greater considering the size of hand luggage carried and people are getting larger.
Math is not my strongest suite but I doubt we will see to many 850 seat varients being built.
But it is only an opinion and we all have one of those
