So....first things first. Documentary filmmakers that need to make a lot of interviews just can´t use this cameras! At least only one of it! But there is something this guy from cinema5d forgot! He could just use 4k25fps and then it was good to go! Or in last resort film it at FullHD an dthen upscaled to 4k. Camera overheating does NOT block up the camera! It only blocks some certain filming choices!If I were planning on using an R5/6 as a primary video cam, esp. for 4k/120, this review would worry me a great deal:
And second thing, that´s why EVERYONE that works professionally with image (stills or video) ALWAYS got to the field with 2 or even 3 camera bodies! Never use only one camera! So, for me my plan is to use both R5 and R6 and deal with the overheating swapping cameras!
Third thing....All types of filmmaking are different...If you are conducting a lot of interviews, or need a camera to record for long periods so this EOS R5 it´s just not the camera! Period! For that, get a C200, or a C100 or a C300. This cameras are meant to make short clips and As I said, in wildlife most of the scenes are made in short clips...Unless you have a very powerful scene that get´s longer....But I never experienced more that 10 minutes straight recording! I do believe i can manage heat by using the 2 cameras and if i can´t record 4k25fps HQ (which will be my main choice) I will change to 4k25fps ALL-I and deal with it. 4K120fps are recorded in bursts of seconds, i never saw myself recording more than 10 seconds in 120fps so also in that mode I can´t see a big issue...
Now, I wont lie, yes like I said before I am a bit concerned, but I guess it wont be a problem at all in 80% of the times! Well... I hope!