PlayStation 4 sales are now beyond the 18.5 million mark, according to Sony's announcement at CES 2015. The PS4's pubertal growth into the late teens (millions-wise) occurred in a prolific holiday season, with more than 4.1 million units shifted worldwide since November 23, 2014.
Sony's numbers represent the company's estimates of units sold to consumers, as opposed to retail shipments. According to Sony, the PS4 "continues to demonstrate the fastest and strongest growth in PlayStation hardware history." To contrast and compare, the PS3 shipped 10.5 million units within a similar timeframe, and the PS2 10.6 million units.
"We are absolutely delighted that so many customers around the globe have continued to select PS4 as their console of choice throughout this holiday season," said Sony Computer Entertainment CEO Andrew House. "We will continue to reinforce and deliver additional value on PS4 as the best place to play, by bringing even more exciting content and by enriching our wide array of service offerings."