Apple has completely overhauled the camera on the new iPhone 6s and iPhone 6s Plus, giving it much higher resolution and 4K video. The new iSight camera now has a 12-megapixel sensor, 50 percent more than the iPhone 6's sensor. The new iPhones will also be Apple's first to go beyond 1080p video with UltraHD 4K. Apple hasn't touched the pixel count on its last three iPhone models, which stayed at 8-megapixels, despite other improvements. However, it clearly felt the need to counter rivals like Samsung's Galaxy S6, which has an excellent 16-megapixel camera.