Lens corrections for Samsung cameras are generally embedded into the raw images and automatically applied in Lightroom and Adobe Camera Raw (ACR). In the current version of Lightroom it isn't possible to determine this from the user interface. In ACR there is an info icon that indicates the profile is automatically applied. Clicking on it reveals additional information about which optical aberrations are being corrected.
If you are able to do so, please post a sample raw image made with the 16-50mm and I will verify this for you. You can use DropBox or another service of your choice and post the link here.