Davies is having a very good season by his standards.
Top strikers in the Premiership - Torres, Van Persie, Rooney, Drogba are having mediocre seasons in front of goal by 'world class' standards. That much should be obvious from the goal charts that was posted earlier by Vulgar. Thats partly because of injuries though.
Strangely though, Vulgar's argument is that even though defences in Laliga are worse, Spanish attacking players are better based on comparing the goal stats of the two leagues. But the same stats and logic shouldnt be used to compare players playing the same league against different opposition because goal scoring charts are meaningless.