Lafiel on 01 June 2020
afaik the only good sales data we have on PS4pro and X1X is from Japan, where the former sold ~1.5m units and the later 20k units (it's Japan) in total
for the PS4pro that represents about 26% (1.5m of 5.7m) of PS4s sold in Japan since it's release
for the X1X that represents about 66% (20k of 30k) of X1s sold in Japan since it's release
So I guess about 20% of worldwide PS4 sales might have been PS4pros since it's release, as for the X1X I doubt we can draw any hint from the jpn data, as the X1 is simply not popular enough there.
