According to the Japanese eShop page for Nintendo's upcoming game Super Smash Bros Ultimate, the game will take up 16gb of storage on the switch. For reference, The Legend of Zelda Breath of the Wild is 14gb. Smash Ultimate takes up over half of the internal storage on the Switch, so if your planning on getting it digitally, you'd better have an SD card handy!
Source: https://www.destructoid.com/digital...16-gb-or-more-of-space-on-switch-513155.phtml