Sony's 4K Action Cam is a capable POV camcorder that shoots great videos, but its size and price put it behind GoPro's Hero4 Black.
4K (UHD) video recording; Good-looking; smooth videos; High 100-Mbps bitrate; SteadyShot stabilization
Larger than most action cams; 4K requires SDXC card; Some quality issues in bright light; Pricey compared to competition