I have just made the switch from Unity to Unreal Engine 4 today and I must say that I’m impressed so far.
When I tried to import a model from Blender (.fbx) I ran into some weird lighting issues.
Physics bounds are also used for skeletal mesh lighting. To fix this you can select those bodies around the neck and delete them, i dont think you’d need collision for those bones. Then select all of the hand bones from the list on the right and add new bodies to them. Pick whichever shape suits you.