I usually trust the sizing on END and Mr.Porter because they do independent measuring of every garment so you get real life sizing. I also see the models are always listed as having 37-38" chest and 32 waist and dudes are always rocking a perfectly fitting "Medium"...lol. For this release, unfortunately, no sizing information really available before purchase.
However, based on the items that i've purchased and received (vest, hoody rugby, pullover) I would say the sizing is not consisten across the collection:
Hooded Rugby - chest sizing, body width and arm circumference is very close to classic fit IMO. It is a tad shorter than usual.
Vest - same as above but felt even shorter because of the elastic bottom. When I zipped all the way up it was comfortable over a sweatshirt.
Pullover - longer in the body then the pieces above, sleeve length on a small is probably 34.5" (not bad for me) but overall the body is very bulky and can easily accomodate a few layers.