I've seen both of them using the default resource occurrence setting. I use the Temperate map setting. I play on small, medium and large maps. But generally play with less opponents than default. My last game I saw numerous grain resources in AI lands. Though I believe in All my games thus far, I have only seen one single material resource.

I don't believe I've ever seen a world event. My next game I will crank up the resource and world events setting to max.

Forgot to mention: I generally play with less opponents than the default. 

Clay Pit and Orchard

Medium world with 4 opponents. Mountainous map and Dense resources.

I always play on sparse. I never have any problems with getting metal or crystals diplomatic capital. But except these "important" resources, I hardly find anything.

I finaly found an Orchard!