A350 is a study in lessons learned by Airbus on A380

http://www.flightglobal.com/blogs/flightblogger/2010/05/airbus-applies-lessons-learned.html

With schedule pressures mounting and a three month slide in commencement of final assembly of MSN001, Airbus is trying to avoid the mistakes of the A380 that it continues to pay for today with a slow production ramp pressured by a slowly recovering global economy, but more importantly a fragile supply chain and the complexity of customizing each airline's cabin.