ALL legitimate work offered up to God is “equally sanctifiable.” How well it is sanctified depends entirely on the person performing it. There’s no reason the work offered up by a janitor would be less worthy than that of a doctor. In fact, if the janitor does his work with a genuine spirit of service, does it as well as he can, and offers it up as a prayer, it is far more sanctified than a doctor who performs a heart transplant for his own glory, and does far more to spread the Gospel and build the Kingdom of God.
In no way is any profession considered to be intrinsically superior to another, at least in terms of it being a path to holiness.
All this presumes, of course, that the work being offered up is not contrary to the Gospel message and has some genuine value for society.