The gap is less than 80:20.
Don't read too much into the PS4 first month sales vs X1 8 month sales comparison.
Both consoles were front heavy in terms of sales and then saw their relative numbers plummet in the subsequent months. This can be interpreted as a sign that consoles are still pretty much a niche, hardcore-specific market in China. Although that group has largely returned to import units.
T-Mall (official reseller of PS4/X1) and JD both have monthly sales number featured on their website. Anyone can reliably compare those monthly numbers to deduct the overall trend. I can not reveal other retail sources I may or may not have, so mods feel free to ban me if you feel I'm reaching into insider territory. (I'm willing to reveal them to Shouta, he knows where to find me.)
*returns to really passive role*