The S5 is already a very capable video camera and the S5II takes it to another level (with the S5IIX a step up again). The built-in cooling fan removes any overheating-related restrictions on clip lengths, so these are unlimited when shooting in 4K or Full HD, even at the faster frame rates of 100/120p for slow-mo effects.
The S5II allows for video recording using the whole sensor area - the socalled 'Open Gate' recording - which is obviously at the 3:2 aspect ratio, but
