I bought the exact same jacket last year in grey in a small and it fit a bit large. Loose everywhere and the hood was a bit small and pulled on your head a bit when it was up.
This years model was redesigned to fit WAY better. They did all the right things. 2" smaller in the back makes it more fitted and seem to have resolved the hood issue. No longer pulls my head back when the hood is up.
I've owned the 4-20 jacket for a year and it's super warm (I live in Toronto ON). I use the grey one for work (construction) and the new black one for outings. It is the BEST winter jacket I've ever owned.