To put it into perspective, Sanchez (swallows a sick burp) is widely (& correctly) regarded as a top class player. He scored 39 in 88 for Barca & has 40 in 79 for Woolwich- if the stats are correct.Not really, he plays for one of the most direct teams in Europe, a bit too attacking maybe, they get beat. Bundesliga is more competitive than La Liga but below 6th it's Rare they take points of the top teams like the Prem (although this year may be an exception).
It's only the ridiculous elite of Messi & Ronaldo who are banging them in at a silly rate- & as you say, outside of the top 4 or 5 clubs in la liga, there is some very poor opposition in their premier league. The French league is poor aside from 2 or 3 clubs, the Dutch league is on its arse, Portugal ain't much better & neither is the Italian league outside of the usual suspects. The Bundesliga is a strong league, but there aren't too many goal a game merchants there. Kane is an elite player. Golden boot winner in only his second full season in arguably the hardest, most competitive league in Europe. He will do for me.