Panasonic offers a wide range of Lumix cameras with 4K video recording, from entry-level and enthusiast Micro Four Thirds models to professional full-frame mirrorless cameras. The best option depends on your budget, needs, and level of experience. 
Lumix 4K cameras for hybrid shooters
These cameras are designed to excel at both high-quality photos and video. 
Panasonic Lumix DC-G9II (Micro Four Thirds)

A powerful hybrid camera with excellent still performance and sophisticated video features. 
Best for: Professionals and serious enthusiasts who need a portable system for both stills and video, especially in sports, wildlife, and nature photography.