"He is world class clearly and is a phenomenal player. It's a real joy to watch (him play). He plays proper cricket shots in all forms of the game, even in T20 cricket. The four hundreds in a row he scored in the IPL were beautiful to watch.
"He stamps his impression on the game and looks to dominate the bowlers. It takes a brave batsman to do that and he is showing no fear. (He's) beautiful to watch," Hadlee said.
Asked whether Kohli is currently the best batsman in the world when there are players like Kane Williamson and England's Joe Root, Hadlee said, "They are different sorts of players. Kane Williamson is a fantastic player. He, without doubt, will be our best-ever batsman.
"He (Williamson) will break all the New Zealand batting records in time and again, he plays normal cricket shots. He just places the ball, sometimes he has the power-hit, but (generally) he plays normal cricket shots.
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Kohli has been in superb form and scored heavily for India in the ICC World T20 championship before carrying on his sublime form into the IPL by scoring four hundreds for Royal Challengers Bangalore.
(REOPENS BOM 13)
While agreeing that modern bats do cause some sort of uneven contest in terms of number of balls crossing the ropes, Hadlee - who will be 65 on July 3 - said that things can be evened out by lengthening the boundaries.
"In Test cricket, we are getting results, you are always going to get results in ODIs and T20 game, so the balance is actually okay. What I would like to see is bigger boundaries.
"Bowlers, at times, do suffer in some formats with smaller boundaries, and you want to make that a contest. Running between the wickets is an important part of the game, but we don't see a lot of threes being run, so make it (boundary) little bigger," he said.
"I started first-class cricket in 1971-72 as a tearaway fast bowler, just trying to bowl as fast as I could and not a lot of control, bowling halfway down the pitch and all that sort of stuff. There's not much of a skill in doing that! By the time 1976 came, I took 25 wickets in six Tests on tours to India and Pakistan - three (games) in each country. That's not bad in sub-continental conditions.
"I was just starting to get it right, with my rhythm and technique being a little more efficient. Again, another big change happened during my career - with (me) going from a long to a shorter run up in English county cricket.