4k (4x 1080p) still is only about 2160px X 1440px or about 3mp compared to a Nikon D90, a 7 year old camera with 12mp of resolution or a newer D610 at 24mp. Even though video can't render such high quality files on TV, the higher quality the starting files the better the result after down sizing.
Here are some shots commissioned by a video house for some up coming TV spots.
Shot on white as the editor want to add color to the backgrounds in post production.
Consider a professional product photographer as another resource in your marketing tool kit.