Hi
as i know they don't have widebody a/c in the SFS Dept.
so the chance to upgrade to the widebody is very small
, & its not easy to move from the SFS Dept. to the normal flight ops.
plus the SFS operation is very difficult there is no duty limitations there...
they will treat you as a machine.
& regarding the salary, housing & all the benefits there is not standers its in depends on your contracts (i don't know much about it)
the quality of life its depends on you, some can deal with it & some can't.
saudi arabia is not open country like yours so think before you do it...