Well, the odd thing here is that WD was released on the 27th and MK was released on the 30th (with the exception of France that I'm aware of). That is 4 days sales to 1 day sales respectively. Either way you look at it, both are impressive. The sad thing are the extremely mixed reviews for WD. I haven't played it yet and I still plan to wait a bit before I do.
Edit: had to look it up a bit, 29th in Japan, 30th in NA and 31st in Aus.
Gotta figure out how to set these up lol.