Gila's career was mediocre when compared to what was thought of Gila when he broke through as a youngster. He still had a great career in general. Won the Serie A, CL and WC. He declined early but while he was going at it, he was always productive in the league and is in the top 10 goalscorers of the league.
Immobile will likely never reach Gila's trophy cabinet. In terms of personal performance he looks well on track to outdo him. 3 seasons scoring above 20 goals plus the one in Serie B. He may even hit 30 this season in the league or more. If he continues at this pace at Lazio in future seasons he'll write his name in Lazio's history and Serie A's in terms of goals scored.