I’ve got a 2019 905 (is that a v1?) am 5’10″\178cm and have a medium. It’s the longest bike I’ve had and wouldn’t want it any longer.
When I first rode it I really noticed the comfort which will be the 2.8″ tyres, have since changed to MM 2.4s and still feels comfy.
I ride everything on it including traditional(?) XC routes, think Cheviots\Gypsy Glen; and trail centres think Glentress\Innerleithen; and non trail centre centres, think Yair\Golfie
It’s a brilliant bike :-)