Maybe not a surprise to some, but now it's more or less confirmed by the president of Nintendo, Furukawa. Serkan Toto has some highlights from a recent interview. It also includes that the Switch is selling software faster than any other Nintendo hardware ever.

1) Japanese daily Nikkan Kogyo Shimbun released a (very short) interview with Nintendo president Furukawa today.

He says Smash Bros sales passed 5 million globally in week 1.

Says Switch is the home console seeing the fastest software sales so far in Nintendo's history.

— Dr. Serkan Toto / Kantan Games Inc. (@serkantoto) January 16, 2019

Talking about software sales. I don't understand if he means fastest selling home console software or fastest selling software (which includes also handhelds)

It doesn't say exactly but I think he meant most software over same span of time and over all consoles.

I already made thread.
http://gamrconnect.vgchartz.com/thread.php?id=238996&page=1#

Smashing success.

God of War 5 million in a month on an install base of 80 million.
Smash Bros 5 million in a week on an install base of 25 million.

These are the biggest releases for an IP of Sony and Nintendo this gen.

This is proof that Sony needs to create strong IPs instead of having marketing rights for third party games. They might help hardware sales initially but third parties aren't reliable and may have Microsoft marketing rights next time, and Sony's marketing right now would not help them. Look at GTA, Final Fantasy and stuff, Sony used to bank on these series being exclusives to PlayStation for sometime but when Xbox 360 did well Sony was messed up and looked to first party games to sell PS3. When PS4 was a success Sony got third party exclusivity rights and did the same mistakes they did when they had PS1 and PS2 as their major platforms. I hope Sony learns a few stuff from Nintendo when it comes to building their IP going forward. Same for Microsoft.