Haaland broke the record for the most goals in a Premier League season with his 35th strike of the campaign in Manchester City's 3-0 win over West Ham United on Wednesday.
Premier League greats Andy Cole and Alan Shearer jointly held the record until Haaland's invasion of the top flight this season.
In his debut season in England, Haaland has scored 51 goals across all competitions.
"It's a bit early to say as these guys did it consistently over the years," Ferdinand told Stats Perform.
"Haaland has done it this season and he's been phenomenal this season, but he'll get judged over what he does over the next X amount of years.
"I think a lot of strikers will say, you can have an exceptional year but can you repeat it, can you repeat it and can you repeat it?
"It looks like he can but until he's done it, it's hard to put him in that category of those great strikers. Although he's having an absolutely phenomenal season this year."
Asked what makes Haaland so special, Ferdinand said: "His pace, his power, his ability to score off his left foot, right foot, and head.
"You know, I always used to say Harry Kane, and so sorry to keep going back to Harry Kane but he's current. I used to say he's the complete centre-forward and Haaland is fast becoming that."
