Hydrogen vs. Battery Electric Cars

Hey all - few questions;
What is the difference in emissions caused by manufacturing the vehicles and additional infrastructure required for each? 
Is the fuel cell with hydrogen recharge less intensive than the BEV over the life span of the vehicle? 
Are we able to do a life cycle assessment to compare the vehicles?
Even in an ideal world with both BEV and FCEV, will this drastic change from fossil fuels balance out as less emissions caused at the end of the life cycle?