Panasonic Lumix DMC-FZ1000K is a fixed lens camera with a zoom-lens that covers everything from wide-angle to extreme telephoto. That's the purpose of this camera, one lens that does it all, and therefore not interchangeable.
Panasonic FZ1000K 4K QFHD/HD 16X Long Zoom Digital Camera Key Features.
Experience the ultimate in 4K QFHD/HD hybrid photography
4K QFHD 30p video with hybrid 8MP post capture
Large 1" 10.1MP MOS sensor for amazing defocus control
Bright Leica DC Lens 25-400mm F2.8-4.0
Super-fast LUMIX DFD focusing technology
Integrated smartphone WiFi for remote imaging control
It's a 20.1 MP CMOS sensor. 8 MP image can be obtained from the 4K video image. It's like a 30 frames per second burst. Main benefit from 1 inch sensor is sharper image, better color and less noise at higher ISO. It's a very high end bridge camera without weather sealing or metal body. It should be an ideal all in one travel camera.
The Panasonic DMC-FZ1000 offers a true Hybrid Photography experience for everyone. It combines 4K video recording capability (QFHD 4K: 3840 x 2160, 30 fps in MP4)* with the ability to switch easily between video and still capture for the ultimate in image creativity.
The FZ1000 also enables in-camera playback screen grabs of (3840 x 2160) 8-megapixel equivalent hybrid photography photos from 4K video footage to capture the spur-of-the-moment shots often missed with ordinary still photos. * 4K video can be recorded up to 29 minutes 59 seconds. When recording videos in 4K, use a card rated as UHS Speed Class 3.