Lukaku is a compleatly different player to what he was at united, iv watched him at Inter and hes turned into one of the best Strikers in football. I have no idea where he has got this pace from but he's so fast which i thought i would never say about Lukaku hes combined his new blistering pace with power.
At inter he plays yes as a striker but he shows up everywhere accross the front 3 his hold up play has increased significantly plus his dribbling has improved he can actually use skill instead of just relying on his power to beat somone 1v1.
His finishing has improved as well 23 goals last season, hes on 13 and 3 assists this season. hes Inters kingpin hes making goals himself as well, game against Juve last season he nutmegged De ligt and then dribbled from the half way line taking players on to create an oppertunity at goal for inter. thats not just a one time thing he has that ability now.
I can see why Pep would want him his first touch has improved, hes brilliant at linking up play with other attackers in the Inter team bullies defenders Conte has transformed him hes nothing like he was at united. looking at City hes a massive on upgrade on Jesus and i never thought i would say that. also one thing that has gone under the radar at Inter is his passing he creates oppertunities out of nothing. theres a clip from a champions league game where he outside of the foot crosses the ball past 2 defenders to Martinez in the box which Martinez finishes.
ill link this vid i know its youtube highlights and its not the best but you will see what i mean by hes different than he was at united.