Can confirm wife and daughter played TPH via GP and now own a digital copy. I'm also about to jump into the Yakuza series for the first time in my gaming life, I wouldn't ever had played Yakuza without GP.
I think Super Data provides Digital sales numbers at times. Usually the manufacturers only provide charts of their store front. You can guess by their percentage cut by digital to physical. Otherwise Sony rarely provide numbers beyond their first 3 day milestone