These Sony full frame mirrorless 4K cameras with interchangeable lenses are Sony Alpha 7S Mark 2 and Sony Alpha 7R Mark 2. The Sony α7S II offers extra sensitivity, wide dynamic range, accurate focusing, and 5-axis optical image stabilization, while the Sony α7R II has a 42.4 megapixel photo sensor. Some video and photo enthusiasts and professionals are saying that these are the best cameras in the world at the moment of their market segment and price for 4K video shooting.