You're also using a flat/mat materials on your model in c4d, if you put a materials that had a higher specularity on it, those same artifacts would appear i'm pretty sure. Point is i think you're problem is stemming from your geo, could we see some wireframes?
Thanks @Holland & @Stockwell for your replies, The way of removing smoothing groups after the import into 3ds Max worked for me. (Never did anything with 3ds max before so thx) I'll post wireframes tomorrow. Maybe I'm going to do a little test-texturing as well, to see where I have to improve my mesh and where I can't fix…
Decent for a first model. You should post wireframes, tri-count and map sizes though. You provided PLENTY of shaded angles to look at, but they don't appear lit. Use marmoset engine for this. Depending on where this model would be implemented, the polycount suggests it would be used for a mobile game. I'd say nowadays the…