Barca coach Ernesto Valverde had warned his side of complacency after Paris St Germain and Real Madrid's surprise exits, and his words carried more weight after Atletico Madrid were knocked out by Juventus despite a 2-0 first leg win.
But while the talent gap between them is nearly imperceptible, their public displays remain unmistakably dissimilar.
"Ronaldo's an extraordinary footballer, but Messi is a genius", Capello told Sky Italia, per Goal.
Barcelona have ruled French forward Ousmane Dembele out of playing for a month with a hamstring injury, endangering his chances of featuring in the Champions League quarter-finals and much of the final stretch of Barca's bid to win La Liga.
"Atletico were a hard team but we were strong too".
Lyon coach Genesio added: "Tonight Messi was in Champions League mode".
The playmaker netted during the victory over Lyon in the Champions League on Wednesday night, but the alleged Manchester United target has acknowledged that his future at the Catalan giants remains unclear.
Both players have winning the continent's elite tournament again as a priority.
Ancelotti, who won the competition with Ronaldo at Real Madrid, said: "Everybody expects him to lose his ability over the years, but he never drops off". Liverpool eliminated Bundesliga power Bayern Munich 3-1 to make the final cut.
"We went out to take the game to them from the very start, we moved the ball quickly and we were at our very best", Messi said.
"It'll be hard no matter who we face. "(Manchester) City, Juventus... Ajax has shown that it has a great team of younger players who aren't afraid of anyone.