The only one that might be noticable at the minute, is Fire on Plantoid creatures, like Funguar for example.
I don't know yet if it is down to my current equipped stave, or the element alignment of the Funguar, but they take significantly more damage from Fire, than my highest specced elements [Ice, Thunder] however, I'm using the started stave, which has a 35% affinity with Fire, as opposed to 0% with my main casting spells.
I'll test it later
Server = Remora - Rank 10 Windurstian
75 BLM (Main)
25 SMN (Future Main ^^)
ZM Complete - CoP Complete - Windurst - Complete
LS - Dragonflies