It is definitely 100% a sabino.
As for the roan/grey look...
There are several things it could be...
A. Simple sabino roaning. Many sabinos look "roan" but are not true roans.
B. A sabino WITH the roan gene. Very hard to tell because the markers of a true roan ios a dark head and legs. Not possible with this one.
C. A sabino going grey. Again, the face is the tell tale part and its covered with white so you can't tell.
My guess is this is simply a sabino with alot of sabino roan. If the horse is going grey, you will loose all that pretty color since the horse wil end up white eventually.
As for those eyes, Id see about gettign them tattooed with eyeliner. It really helps these pink skinned eyes. Ditto the long nose fly mask at all times when the horse is out in the sun.