I disagree, Drogba is no where near Henry, Terry and Lampard are an apples and oranges comparison.
Going purely by statistics for players playing 80+ games in the PL you do every week with Aguero and Kane. All three are very close to .70 goals per game, and have maintained it over a long period of time like Henry. The next best is Shearer at around 0.60, but given the longevity of his career and the sheer number of goals it is still a phenomenal record. You could even say someone like a Salah or Suarez is better on a goal ratio perspective. But they have not achieved it over a prolonged period of time like an Henry. And this is the biggest test, to maintain such a high performance level. The jury is still out on Salah to see if he can maintain his level of excellence over a prolonged period of time. Suarez left the PL to play in Spain, so harder to judge.