That's great news for PS4 but there are a couple of things to take into account.
PS4 million sellers are all launch titles, WiiU only had Nintendoland.
Wii Party U will pass 1M next week, and Wii Fit U is a guaranteed million seller.
Wind Waker HD will pass 1M in about a month and a half or so.
WiiU will add three more million sellers in March/April and PS4 has none on the horizon.
Finally, company executives from both Nintendo and Sony have stated they don't consider themselves competitors.