Advisti

The person I responded to obviously doesn't as he said F5 doesn't do internal 4K. The "paid" 4K firmware update 2 years ago was less than $1000 which is peanuts given we are talking about $10,000+  cameras.  Even before that, there was hack that allowed internal 4K recording anyway. Most F5s sold today are already updated to 4K fw version, aren't they?
The point is that when C300 Mk II was released, F5 by that time, already did internal 4K. and much more (ProRes, DNxHD, HDCAM SR 422 and 444,  10-bit XAVC, high frame rates, all internally, and 16-bit raw to AXS-R5 raw recorder.)
 

One more time, F5 can do internal 4K since 2014 after firmware upgrade (there was a free hack before that allowed 4K on F5 anyway, internally, without external recorder).
Aside from 4K December 2014 update enable recording in Apple ProRes and Avid’s DNxHD codecs directly to the Sony SxS Pro+ memory cards that the camera normally uses (note that's internally). These cameras already supported XAVC, MPEG2 and HDCAM SR, not to mention the additional RAW option that's available if you have the AXS-R5 raw recorder.