Oh, and the fact that they're just 23 and 21 respectively means nothing in possibility the to increase their level in the coming years right?
Were was Falcao six years ago? At 21 he was at River Plate and had his first succesfull campain scoring 19 goals.
Ibrahimovic at 21 was at Ajax, and scored 15 goals.
I'm not saying that Ljajic or Jovetic will become players of that magnitude. But you can't deny that they're young and can improve a lot in the years to come.