Gomez has scored 24 goals in 25 games this season, and already looks on track to better last term's 49-goal haul.
And Kirsten has seen enough to believe that Gomez is the best striker in the world at the moment, and that he can get even better.
"In Europe and indeed worldwide, Gomez is at the time the striker par excellence," Kirsten told Bild.
"I prefer Gomez over Ronaldo, and I think that Gomez will develop further. He's only 26 and has already shown that he can survive difficult periods."
German legend Gerd Muller also heaped praise on the Bayern spearhead, and believes he will one day claim the record of most Bundesliga goals in a season.
"At some point, he will beat my record of 40 goals in a season," Muller added.
Gomez also has an excellent strike rate at international level, scoring 21 goals in 50 caps for Germany.