His life is as fully committed to books as anyone I know
is fully committed to books的主语是his life,所以后面比较的对象（as...as）应该也是anyone's life,as...as连接比较的对象是,前后比较的内容应该是一样的.所以,应改为：
His life is fully committed to books as anyone's life I know.前面的as要省略吗？as...as作为一个结构，用来比较两种事物之间的情况，像...一样。所以前面的不用省略。如果省略的话，可以把这句话改为：He committed his life to books, as I knew.（此时as作关系代词,引导定语从句,表示正如）