I may or may not have bought both the eShop and physical versions of the game just so I didn't have to open the physical copy...
Fire Emblem is shown as #1 in Recent sales on my eshop (NA) but doesn't show on the all time sales yet, New Super Mario Bros. 2 seems to be the only full retail game on that list at #20. Wonder if FE can break into it and how long that would take....