From what I know, 5d2 is definately cheaper in msia compared to spore and the best price are the same at most shops.
As for Penang, I don't have knowledge they are cheaper than KL. From what I see Penang has large pool of photo enthusiast and mostly Nikon user (since film era). Canon is trying to gain some market share. So not surprise if canon have special price.
Well, I was in transit at Penang Airport, can't remember the name of the shop, but the guy assured me that it was not duty free and their branch in penang road sells the same price.. about 7000 RM plus for d5 Mark 2. That's why i was surprised. He just didnt have stock. Thanks everyone.