[davidmanze]

The 5D mk IV's 4K has a high IQ quality codec for serious work. Not some low bitrate high compression job. High compression is fine for some kind of end product, but what the 5D mk IV offers is better for source material, for sure.

 

The headphone socket needs space and a place. So does the 2nd card. So, bigger camera = 5D, smaller simpler camera = 6D. 

 

  Motion picture Jpg is just a stacking system, a series of Jpg images pumped out into the card and needs little extra processing to produce a movie train and produces within the limitations of Jpg quality itself.

  H.264 is an on going compression codec that samples last frame/next differences and from that can reduce the amount of space required when the image remains or only changes slightly, it also has good noise control, reducing the need for full Jpg image sizes for each frame update.

  

  The extra processing power that is required to transform motion image Jpg into H.264 (or the newer H.265) in camera is quite considerable and would require a far more powerful processor within the camera itself which of course equals more expense.

 

  In the end those using MP Jpg will have to choose whether they process their files in their uncompressed form with all the addition time and processing time needed.... or compress them into H.264/5 and have a far more practical file size for processing as well as having far less problems in storage.

  The difference in quality "is" there, MP Jpg but it's very very minimal, there are less remaining artifacts caused by movement from frame to frame in comparison to H.264/5, from those using both codecs it is only in very low light that there is, if any, visible difference.

    The bottom line is this restricts it's usage to small clips for which it is fine, anything beyond that the files are impractically huge and few to none will store them in the MP Jpg form.

 

 

  As Jordan from the camera store stated in their review of the 5D MkIV:

 

  Canon have made it clear for some time that, if you want to shoot pro video, they don't want you to shoot your video on their EOS still cameras, they want you to shoot it on their EOS professional cinema cameras!

 

   I see it the same!

 

 

  And let us look see in the next few years to come to see just exactly how Canon will manage to overcome the space shortage for their missing headphone-jack and second card slot...............

 

                                     ...........when they do it will surely go down in annals of scientific history as to how they achieved this seemingly impossible feat of human engineering!  

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    Every five years Canon brings to market a two year out of date camera! 

 

  (actually I borrowed that quote from Dpreview forum, I burst out laughing when I saw it)