Monogatari series monster season is the best entry in the series as of now and the best work by Nisioisin. As always the art made for the series is made by vofan. This season has by far the most unique narrative out of any previous ones and reminds of Nisioisins other work "zaregoto" Another diffrence from other seasons is considerably more serious tone compared to other seasons. Introduction arc of season 5 is also better than other season. But we all know that introduction arcs never were the strongest part of this series.As for everything in between the Introduction and final arcs
It is also consistently amazing and well written.
With Ougimonogatari being one of the best middle volumes entire series has to offer.

Now its time for the best part of this season
Final volume
It is arguably best volume of any series Nisio had ever written but it is really interchangable.
It is split into 2 arcs
and one of these 2 (Nadeko Araundo) is eaisly best arc Nisioisin wrote to this day.

Both character works and story/plot are the best out of the series
Although the antagonists of this season are not as good as season 3/final season
but they are still amazing.

There only real issue with this season is lack of official translation.