We were very heavily linked to him at Hoffenheim, and his pressing, defending from the front, ability to create space for others, general link up play etc. is probably the the level Pep would like our two strikers to get to. I don't think there's any other striker in Europe who does more work for teammates than Firmino, and Pep has talked a few times about trying to get our two to improve on that front.
In the past the problem was he didn't score enough, but now he's gonna get 30 for the season. And he's only 26. He's Liverpool's best player.
IMO Jesus has the potential to be much better, because he's got greater natural goalscoring ability and he's faster and a better dribbler (or he was in Brazil we haven't seen much of it here yet) but I would bet if Firmino ever came up as a topic of conversation between Pep and Jesus, it would be as a player he could potentially learn a lot from watching.
Also very good in the air despite being about 5'10''.