Saruman is Mountain level based on two to three feats from the books:
- Aragorn stating Saruman was going to bring down the mountain, of which he and Saruman had confidence in.
- Gandalf destroying the side of the mountain he fought Durin's Bane on.
- General scaling from the total damage and time duration of the War of Wrath.
However, that's still about equal, if not inferior, to Canon Dooku's Force Abilities, as they shouldn't be a whole league under Vader's, who used Force Shield to tank the explosion of the largest factory in the Galaxy in one of the comics in the New Disney continuity, which was a Small Island level feat based on previous explosion feats below this from TCW. He also has far superior reactions and combat speed based on laser deflection feats from inferior Jedi, which is enough for him to blitz anything Saruman can dish out.
EU Dooku is a completely different beast altogether based on the general scaling most Jedi and Sith get in the EU continuity based on feats of characters such as Palpatine, Exar Kun, etc., enough so that Saruman would be oneshot material to his Force Lightning.