Ronaldo's duel with Salah takes centre stage as Man Utd face Liverpool
The Egyptian forward has been in superb form, with his sublime strikes against Manchester City and Watford already goal of the season contenders.
But Ronaldo hasn't been far behind with a series of crucial goals underlining his superstar status.
So who will be this season's preeminent force?
Sunday's crucial showdown at Old Trafford will go some way to deciding that question.
Without a win in their last three league games, United are four points behind second-placed Liverpool.
Just 24 hours later, Ronaldo stole the European spotlight with the late headed winner that completed United's fightback from two goals down to beat Atalanta 3-2.
United manager Ole Gunnar Solskjaer naturally leans towards his player in any debate about the best of the best.
But he admitted Salah's red-hot run makes him a fearsome proposition.
"I'll always back Cristiano in any competition. He's unique. That being said, Salah, at the moment, he's on fire," Solskjaer said.
"We know we have to be at our best to defend against him. We have to focus on them for 95 minutes to keep a clean sheet.
- True greatness -
Asked to debate the virtues of the pair on Friday, Klopp took a diplomatic approach as he highlighted each star's quality.
"Even when Ronaldo's left foot is not that bad, I would say Mo's left foot is probably better.
"Maybe then Cristiano in the air is slightly better and the right foot is probably better.
"But speed-wise they are both pretty quick, very desperate to score goals, so maybe that's it."
It is the ability to propel a team to silverware that defines true greatness and, on that front, Ronaldo has the edge, for now.
Liverpool will surely have to bow to the 29-year-old's demands, given he has scored 137 goals in 214 games for the club since joining from Roma in 2017.
The 36-year-old has amassed 124 goals in 300 United appearances over his two spells with the club.
He has also won the Ballon d'Or fives times and is the record goalscorer in both the Champions League and international football.
However, Klopp believes Salah has the right character to stay at the top for years to come.
"Mo is incredibly professional. He's really the first and very often the last out of all the players," Klopp said.
"He's constantly interested in all the different things he has to do to improve. He has still a lot to give, 100 percent."