Landscape assets are always handy to have around. Regardless if you create your own, or purchase some, a library to keep at hand and grow, is never a bad thing. If you are a C4D user, you should consider grabbing the Ultimate Mountains Pack from Vladimír Mrkvica.
Vladimír Mrkvica is a freelance 3D generalist and VFX artist from Slovakia who has created 22 different mountain landscape assets, that you can download and use for free. No plugins are required to use the assets in your own work. You can alter the level of details in the mountain assets by changing subdivision surface attributes. You can get a pretty high level of detail with them.