Switch roughly two thirds of the way to outselling PS3 in Sonyland after just over 4 years. If Nintendo are smart and give it at least another three years, it'll get there.

As for PS4 vs DS, the slow crawl of the two titans continues. Depends on whether Sony is well and truly done with PS4 hardware wise or will continue to push it alongside crossgen software like Horizon 2 and God of War Ragnarok.

I don't expect the PS4 to sell much more than another million units in Europe.
It's likely not going to reach 50mil.

Switch has weathered PS4's peak holiday season with nary a flinch in the US; with less than 6 million to go and Nintendo's system on track for a potentially record breaking year, PS4's fate is essentially sealed.

There are two scenarios where a consoles holiday season is almost indistinguishable from the rest of the year: when it sells extremely well or bad. With the Switch vs. 3DS and WiiU comparison we can see both on display. In 2020 the Switch went so seamless into the holiday season that it's not easy to see where it exactly began.
The final holiday season for the other two on the other hand is barely a bump.

Switch right on the cusp of outselling both Xbone and Wii U + 3DS in US. Both have been fun charts to watch as the gap closed, and it'll be great to see the chase finally conclude.

Xbone is already slightly ahead and Wii U and 3DS are discontinued so it's already over.

Well, that's Wii's last big holiday month (2010) right? From here on out Switch should be in a constant state of climb (with the possible exception of when it aligns with Nov/Dec 2011) until it overtakes.