Nugat

R5 will be a great hit with Hollywood productions. A perfect companion camera to Arri or Red, costing a fraction, weighing nothing (drones).
The IBIS replaces the steadicam, the F2 / 28-70 is like  a set of top primes. In the standard 4k/24, R5 records for hours. When FX/greenscreen is needed-
8k raw kicks in. Overheating? The length of the average take is 1-2 minutes. The  breaks between takes  can be really long. You need to sacrifice a camera?
Ridiculos cheap. Need 10-20 units for the big battle, fights, crashes, explosions  or chases? - no problem.  SloMo - check. Arctic shooting - love it.
Ergonomics - check.  Cinema verite onobtrusivness - check. Run-and gun - check. Etc, etc etc. 
 

"Cinema Line" of any camera manufacturer is not only about picture quality. It's also about reliability, workflow standards, service reaction time... FX9 is at the bottom of Sony cinema line, a one-man-show camera. But it borrows the 6k sensor from the top Venice and the lens mount is cinema modified. That alone might cost more than A7s. It also has unique functions like electronic auto ND filter. In October it will get firmware 2.0 and RAW hardware. A7s bricked on one tester when he put the overheating  control option to "off". The media were destroyed. Why would Sony even enable such a function? Will they remove it after some productions lose their media? Fortunately Canon R5 does not allow to shoot past the danger point.
 
 

The R5 overheating is a humbug. Canon used the 8k spec as a marketing ploy to create hype. It worked.
In fact R5 is an excellent photo camera with some amazing hybrid video capabilities.
4k/30 has no thermal limitations on R5. 8k will be used in pro environments for FX,   reframing , compositing. Same as 4k was used for 2k DCI.  In drama productions, the takes do not last 20 minutes. Not even 10. And typically there is always a spare camera on set. Or two, or more. 
Any users in need of long takes in 4k with  above standard film frame rates will be better off with Sony a7s iii , which takes only 12 mpix photos. Horses for courses.
PS. I'll have my R5  delivered mid-August.