Sorry, I meant Juve overall. I don't see him fitting in Conte's plan nor scoring more than 15 goals like he does in other teams unless Conte changes the system for him.
You may well be right in that regard.
If Conte keeps the 3-5-2 (3-5-1-1, given that one of the forwards almost always plays more like a trequartista than as a centre-forward), Ibrahimovic would probably be trequartista and be given the primarily creative role that Vucinic has had this season, rather than leading the line as he does for PSG and as he did for Milan and Inter.
Now, playing like a trequartista is by no means new to him as that is where he tends to play for Sweden, I believe, but it is entirely possible that that role would result in him not scoring all that many goals, though he could still have a hugely posistive role in the team playing there even if he didn't score a lot of goals.
Vucinic, for instance, has had a very good season this year, but isn't going to end up with many goals in Serie A (10-12, probably). Ibrahimovic is, of course, a significantly better player than Vucinic and he has more of a goal-scorers instinct, so would be likely to get a few more goal than Vucinic all thing being equal.
Llorente is better then lewandowski
I'd say they are on a similar level.
Both are very good players, but neither have really had the chance to prove themself capable of consistently making the difference at the top level.