ANSWER
Weapons (1st person and 3rd person bind models)
1st person: about 6000 triangles (same as cryengine1; not more really needed – above, normal maps are not needed)
3rd person: about 1500 triangles
Characters
As we are using attachments we have to split the triangle numbers in the separate parts:
* Heads 3k triangles
* Body 5k triangles
* Attachments 1 k triangles
Vehicles
Max. 20000 polygons is our internal limit
Buildings
Hard to answer – put detail were detail is needed. No real need to go crazy. If you only have a few buildings in your level you can spend more triangles, but you should be careful in City maps.
Vegetation
Between 500 and 2500 triangles for trees –whereas the ones with 2500 should not be used in a dense forest because of the filtrate – It heavily depends on the scenery you want to create.