How much quality we would gain with Sanchez over Vucinic and Giovinco?
Sanchez is superior to both of them in man-to-man situations. On the counter or simply against defenses less organized, Sanchez will prove much more direct and dangerous then both Gio and Vuci. Gio and Vuci finishes quite alot from distance whereas Sanchez is more of a through-ball kind of attacker. See him past his opponents with Isla on the side or Vidal behind.. Sanchez is just incredible to watch, a true fighter as well. Vucinic and Giovinco aren't work horses - they dont't fight for every ball - Sanchez plays similar to Vidal with incredible stamina and work rate when off the ball..
And then he's got that extra IMO. I believe Sanchez will fight to one day come into consideration of one of the worlds best footballers. I've never seen that in either Vucinic or Giovinco. Both are incredible footballers but with Sanchez it's a bit like he want this glory a little more.
The determination to do well is present in everybody but none can argue both Vidal and Isla are some of the most ambitious. Vidal for one is fighting to become the worlds best, how many of our other players do you see doing that? Marchisio? Pirlo? Barzagli? Buffon? Pogba? that's about it TBH.
Vucinic could have become much much better then he is if he had the determination of Vidal. I see the determination in Sanchez, and so i hope he can reach world class level in years to come