Looking at Ibra, moving from France to Britain effectively halved a lot of his attacking stats.
Final season @ PSG = 1,34 goals per 90. 0,46 assists per 90. 1,2 dribbles per 90.
First season @ Utd = 0,63 goals per 90. 0,18 assists per 90. 0,6 dribbles per 90.
Passing accuracy, through balls and fouled per game were all significantly down too.
Depay also showed an attacking boost once he arrived in france also.
Final season @ United = 0,12 goals per 90. 0 assists per 90, 1,0 dribbles per 90. 0,4 Key passes per 90.
First season @ Lyon = 0,41 goals per 90. 0,57 assists per 90. 2,5 dribbles per 90. 2,0 Key passes per 90.
Lacazette also has seen a big drop in attacking stats between these two leagues.
Final season @ Lyon = 1,05 goals per 90. 0,11 assists per 90, 1,6 dribbles per 90. 1,7 Key passes per 90.
First season @ Arsenal = 0,44 goals per 90. 0,15 assists per 90. 1,0 dribbles per 90. 1,0 Key passes per 90.
Like Ibra, he also saw a decline in his passing accuracy and the amount he is being fouled.
We have seen similar with the likes of Di Maria, Balotelli, Thuavin, Falcao - players who objectively failed in the Premier league and yet are among the best attacking players in the French league. All this suggests to me that the level defence and goalkeeping there isn't as high as here as players are under less pressure to pass & shoot, dribbling around players is easier with them often opting to foul players as their solution.
This makes it really difficult to weight the value of attacking metrics in the French league with those from the Premier League. The certainly aren't of equal value, I am sure almost anybody in analytics would agree with that. How big is the disparity between the two leagues though? Or between Spain and France for that matter.
And this is probably why the likes of Cavani and Ibra were never seriously mentioned in the conversation for best player in the world when they were scoring 50 in a season at PSG. Of course they are great players and that is an achievement, but somewhat diminished because it is happening it what seems an inferior league. It is probably why he will be overlooked also when it comes to winning the Ballon D'Or too.