Depends on your definition of it. If you were asked who was the player of his generation ('10s) most would say Messi, but most would also put Ronaldo at a comparable level.
That's the same as Pele, Garrincha and Eusebio in the early 60s, Best and Charlton in the late 60s, Cruyff and Beckenbauer in the early 70s, Zico and Platini in the early 80s, Maradona and van Basten in the late 80s, Ronaldo and Zidane in the late 90s etc. And that's ignoring the likes of Muller, Gullit, Matthaus, Scirea, Baresi etc. who are considered among the best in their position in the last half century, never mind the likes of Law, Tostao, Neeskens, Laudrup, Boniek, Rivaldo etc.
You could pick a standout player from any generation but in most generations, at the time it wasn't that clear cut. I'd say it's impossible to call between Cruyff and Beckenbauer too, personally, and I wouldn't put either in a lower bracket than Ronaldo.
The reality is there are numerous times in history when some of the best players of all time were playing in the same national team (Pele and Garrincha), same club team (Charlton and Best), same league (Maradona and van Basten, Ronaldo and Zidane) or played against each other in major finals (most did).
What's different about Messi and Ronaldo is the length of time they did it for, which is partly down to advancements in sport science and a change in rules to protect offensive players, alongside the numbers they put up over that time, which is partly down to them playing in an era where football is dominated by a small group of elite clubs in a way that hasn't been seen before.
That's not to say they aren't remarkable players but people try very hard to paint this idea that what we're seeing now has never been seen before. It's how the media and society works. The truth is the facts don't align with it very well.