So you are planning to jump from 4k to 6k for your video projects? The PANASONIC LUMIX S1H camera is worth a look. It is a 24.2 full frame digital mirrorless camera with 6k/24p recording capability. It can record 4:2:2 10-bit video internally and has a HMDI out too.
The camera features dual native ISO, rugged camera, V-LOG/V-GAMUT, and 14+ stops of dynamic range. By attaching it to a gimbal, you can use the S1H for active filming.