Mileage may vary! The basic problem for an English speaker is that some languages are more translated than others. There are far more people translating from Greek, Hebrew and Latin works, than from Tibetan or Ge'ez (an Ethiopian language).

I've heard about the Taoist canon recently, which is seemingly vast, and despite Chinese being a major language, and a substantial number of people knowing both Chinese and English... Only a fraction of the Taoist canon is available in English.