Son is exciting to watch and works his socks off. But Kane is on another level. He's totally capable of scoring 30 goals a season, every season which on it's own is special. But he can also drop back and spray passes around like Pirlo. 30-40 yard passes onto a 50p with his eyes closed. Potentially when he's 32-33 and his legs are going, he could drop deep and dictate games from there to keep his career going even longer.
You don't think Son is capable of scoring 30+ goals a season? I think he would have been more than capable had he:
1) Got as much playing time as Kane. Remember, for many seasons Son came off the bench 30-40% of the time.
2) Took penalties instead of Kane. This alone accounts for 5+ goals a year.
3) Played the striker role instead of wing
Despite his relatively limited role, Son's averaged 20 goals and around 8-10 assists a season the past 4 years. Give him the same opportunities as Harry and I think he gets 30+ goals a season, easily.
The man is actually on pace to score 25+ goals and 20+ assists this year already. The next level after this is Messi/Ronaldo type of production.