Nothing totally concrete. The bf4stats I linked above.
Good things to follow are the threads on Neogaf - NPD sales results for the USA, and PAL Charts Week # for he UK. They are incomplete, but hey incomplete information is our thing
PAL come out every Monday, NPD the second Thursday of each month end of day EST I think (delayed until Monday this week because of E3 week)
There are useful nuggets in all of them though. For example last week, launch week for Watch_Dogs, it easily hit #1 in the UK PAL charts, overall and all formats. They posted the breakdown, 49% PS4, 27% XB1. PS3/360/PC making up the rest. Digital sales not included.
I can't remember exactly what, but I'm tempted to say Lego games - Some franchise XB1 regularly outperforms PS4 in the NPD monthly sales results. They generally only give an order of popularity in those, although sometimes people can extrapolate gives a few known numbers.