I decided to clean it. It took two passes of wet swaps and dry swabs each to clean the spots from the "sensor". The before and the after shots are shown below, both shots are stacks of several shots (5) to enhance the spots. Again similar to the Canon 6D (which has sensor cleaning and the sensor actually sits behind the mirror) I believe the spots on the Sony A7S sensor is caused more by evaporated condensation droplets from previous cold night outings.
Before : Spots on stacks of last night's skyshots taken on 135/2.8 @f/2.8
After : No spots on stacks of bright room taken on 35/2.0 @f/11
After : No spots on stacks of bright room taken on 135/2.8 @f/2.8
After : No spots on stacks of bright room taken on 135/2.8 @f/11
I guess that sorted out the "sensor" cleaning agenda on the two full frame cameras. I haven't seen any major dust/spots issue on the Canon 7D and 7DMk2 perhaps because both are mostly on daytime duties and have not experience evaporated condensation issues due to drastic warm/cold/warm changes. Rest assured though , if they do exhibit these problems later on, it will be dealt with delay using the Green Clean Wet and Dry Sensor Cleaner.