replace EXCEPT by JOIN

The following construct does what I need but is there a better way of
expressing this?

select * from
(

SELECT DISTINCT
section.section_pk
FROM ITEM
LEFT JOIN product product ON Item.product_fk = product.product_pk
LEFT JOIN section section ON product.section_fk = section.section_pk
WHERE item.export = 'f'

EXCEPT

SELECT DISTINCT
section.section_pk
FROM ITEM
LEFT JOIN product product ON Item.product_fk = product.product_pk
LEFT JOIN section section ON product.section_fk = section.section_pk
WHERE item.export = 't'

) as X