Maybe comparing between players is not very appropriate, because these players have different characteristics and also as you mentioned different playing positions so that they give different results, also which club they play for is very decisive.
Haaland still has a very long career at the age of 22, he can achieve many achievements when he remains consistent, and also when he can correctly choose the club where he will have a career, because it is possible that Haaland will look for other clubs and not only in the English Premier League to get more.
Its seems fair when comparison between Lionel Messi or Cristiano Ronaldo achievement with Haaland on 22 ages, so far Haaland have ben success winning treble winner and lead top scorer in Primer League then Champion League. What the best achievement from Ronaldo and Messi when their age on 22 years old? Haaland still you age and he has man years for collecting many trophies at the future and potential for him can get more goals achievement than Ronaldo or Messi.
Manchester City is the most lucky team after success signing Haaland and what the first season impact bring citizen won treble winner, has chance for Haaland next season score many goals again and probably winning Primer League and Champion League for next season.