I'm bilingual in English and Japanese (When I am in Japan, people can't tell I'm not from Japan until I tell them).

I seem to have have better than average graphic memory (I remember taking tests and picturing a page in the textbook or a page of my notes in my head, then picturing where the information was on the page, then seeing the info itself on the page).

I have no idea if this is because of learning 2k Kanji characters though.