Aye, Origi is nothing like either Fowler or Wellbeck. Hesky is closer, but still not that close.
It's hard to think of a really similar player. In terms of skill set / physical attributes, the closest I could think of was actually Balotelli. But in terms of mentality there's a big difference. Balotelli is cocky but lazy and unprofessional. Origi is harder working and more of an honest pro, but seems to lack a bit of self-belief.
I think Origi could be a really top striker if he had more belief and determination. It's hard to get that into a player if they don't already have it, but if Jürgen could release that in him, he would be a cracking striker. He's got the skills, the physique and the pace. Good finisher on his day as well. Just needs to be a bit mentally tougher.