Actually if you restrict sales to just to the period that all 3 major platform holders are offering the same generational line-up PS4 is actually Playstation's best selling console. PS2 had barely hit 100m units when 360 came out, they shipped a further 50+m after that. You can still Google the then contemporary news reports to see when Sony announced they passed the 100m shipment mark, it was at the end of November 2005!
This stuff simply isn't debatable, you can corroborate when this happened using numerous news reports from when it happened . All of which makes the fantastical version of history presented by Nhranaghacon easy as pie to debunk.
PS2's generation was shorter by anywhere from 1-2 years vs. PS4, though it undoubtedly benefited from launching earlier and having exclusive deals with third-party publishers.
Moreover, as I was saying before, the size of the video games market more than doubled from 2000 (PS2 launch year) to 2013 (PS4 launch year), with consoles market growing c. 30-35%. It's unlikely Sony will ever achieve the kind of domination/penetration it achieved with the PS2, considering the bulk of the growth in gaming nowadays is in mobile. PS4 has been an incredible performer, don't get me wrong, but it will take something else to repeat what the PS2 achieved.
Market data here: https://www.bloomberg.com/news/arti...me-top-analyst-sees-industry-slumping-in-2019