Would I be able to land the real thing now?
Nope.
Flightsim is pretty poor at modelling a Cessna 172's dynamics, never mind something big and fast. At the end of the day it's a £50 pc simulator.
Real-world weather, pitch-power couples, stabilised approaches, trimming, sensitive power levers - there's a big long list of things you need to be very familiar with to successfully land an airliner, and you won't learn much about these from flightsim.