Lewandowski still has poor efficiency, a low percentage of scoring chances, he is lucky that this season he has much more of these chances. It is generally a pity that so far Mbappe (or someone else) has not raised the bar to the level of the Ronaldo-Messi era, now the favorite for the golden boot is Salah with 25 goals scored. But this is a ridiculous figure if you remember the past. La Liga must regain its leadership in this area.
Lewandowski problem is just age, he does not have the agility he used to have in Bayern, but the stamina is still there and he knows where to position himself for a goal. Mbappe git alot of critics earlier this season( it wasn't the mbappe i used to know earlier this season ) plus having injury twice I think.. he started picking up after Vini injury return and so far he's been able to make it that high even not being at his best, next season should be totally different for him.
Lastly, it will take a while to see people like Messi and Ronaldo, they literally shared all most 3 generation golden boots
.. I still don't see someone close for now to doing that maybe next Gens/never, absolutely end of an era