Canon announces new XF400/405 camcorders

Yes at a whopping 8Mbps. Basically a proxy mode. This is a pretty small camera like the old XF100. Definitely not an XF300 replacement.
 
I am concerned about the battery life. My C100 goes forever on the extended batteries. If the XF400 doesn't perform well, I'll keep my C100 and get a C100 ii for my 2nd cam.
 
According to Cinema5D, you at least have 8-bit 4:2:2 up to 25p externally in UHD. Not sure if true as new specs are initially sometimes messy on the internet, but it would make sense as everyone else offers at least 8-bit 4:2:2 over HDMI.

The HDMI output is likely 4:2:2 for 2160p30 and below as support for 4:2:0 subsampling was only introduced in HDMI 2.0 along with 2160p60 support. This has generally meant that for HDMI output up to 2160p30, most cameras output at least 8-bit 4:2:2 which maximizes compatibility with displays that only support HDMI 1.4.

When outputting 2160p60 over HDMI, then 8-bit 4:2:0 is much more common (even though HDMI 2.0 supports up to 12-bit 4:2:2). It's possible this is also to maximize compatibility. 2160p60 at 8-bit 4:2:0 actually fits within the 10.2-Gbps/300MHz bandwidth supported by HDMI 1.4 (any higher bit-depth or subsampling requires 18Gbps/600MHz bandwidth). Which meant that in some cases manufacturers could take existing 10.2Gbps HDMI chips only designed HDMI 1.4, make a few firmware tweaks to add support for 2160p60 at 8-bit 4:2:0 and re-certify them for HDMI 2.0. This is in part because it's not actually required to support all the different possible signal formats to be considered HDMI 2.0 compatible. More on HDMI 2.0 at:
http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx

Signals that use the full 18Gbps/600MHz bandwidth (2160p60 at 10-bit or higher or 4:2:2 or higher) also put greater demands on cable performance and there is a new "Premium High Speed HDMI" cable testing and certification program for such cables. But for signals like 2160p60 @ 8-bit 4:2:0 that fit within the 10.2Gbps/300MHz bandwidth, older "High Speed HDMI" (Category 2) cables designed for HDMI 1.4 should work fine. More on the "Premium High Speed" HDMI cable designation at:
https://www.hdmi.org/press/press_release.aspx?prid=141
 
XF405 battery vs tripod

XF405 battery vs tripod

I have no trouble with battery of XF400 vs tripod, I have manfrotto 701 HDV head.
 

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"the 5D Mark IV is around the same price and shoots much better 4K with the same DPAF technology."

Apples and oranges, sorry. It's a tool for professional video journalism, not a poor-man's RED (5D4). We've all known what DSLR's bring to the table since the fall of 2008. I said it then and I'll it now. DSLRs are crappy video cameras.
 
Any camera may be a tool for professional video journalism if the user sees fit.

No comparison between what was offered in 2008 vs. 2018.
 
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