Yes, but it wasnt really Super Barca. They were great but that era ended by the time Xaviniesta's peak ended.
It was MSN having an insane season in 2015, they went out of the quarters in 2016 and then Neymar left. The rest is history. Barca was falling behind RM ever since. While RM kept rising and rising.
As for the competition, I actually agree M&K faced tougher competition but not by a long shot. Kroos (although young) couldnt even make it into the Bayern team of that era. Juve was actually good back then.