I wouldn't approach this situation with any optimism.
Look at the track record. Demand for new cars is highest when the model is brand new. If the 4200 had been launched with the handling and gearchange of a GS, it would have been a bigger hit. If the GT had the 4.7 from the start, it would have been a bigger hit. But the first iteration of a new model gets all the attention - if that is flawed, it is hard to undo the damage with later facelifted versions. The GS and GT 4.7 got great reviews, but it was too late!
Now throw Alfa into the mix. The 4C. Great ingredients (ok, maybe not the engine), but something went horribly wrong. I suspect that the 500bhp Giulia will be great in some respects but will have at least one huge dynamic flaw that makes the driving experience inferior to that of the M3 or C63.
Compare all this to what Porsche did with the Cayenne - the first version (let's set aside the looks) drove better than the competition and was a huge hit. It redefined what people expected in this segment. It also helped that the Porsche brand is know for great driving dynamics. Ferrari also hits the bullseye first time, or at least they do with their most important models (California was an exception, maybe 575 but that was in itself a revised 550). The 550, 458, 599 and F12 are all awesome. When Ferrari release a revised model, it's simply to make it even more awesome, like the Speciale.
The Levante, although it's hard to judge from the disguised pics, looks lardy and under-wheeled. What is it about this SUV that is going to blow the competition away?