Well, the leather set items are good. 3 crit/haste, 2 crit/hit. In the off-set slots:
Wrists: Leather has spirit/haste, Cloth has spirit/haste and crit/hit (so potentially a cloth bis, depending on other good hit items).
Waist: Leather has spirit haste, but Cloth has crit/haste (so bis cloth)
Feet: Leather has crit/spirit in 25m and crit/haste in 10m, but Cloth has nothing yet (?)
Going by items on
Icecrown Citadel Loot