One worry I had was that these files would be so big that my existing laptop would grind to a halt!
I am, and will upgrade the Laptop, but as I can't get the envisaged whopping discount on the HP Workstation, I will have to sell my 5D3 to fund the PC migration.
Apart from a few times - I was pleasantly surprised, that the Laptop really does cope pretty seamlessly. I do have an SSD disc with a 6 MB/s SATA III controller. Yes, there are moments when it goes mental in turbo mode, and the fan screams but its only a few seconds - overall though, it is very workable.
I Thought I Would post this discovery as it was a concern I had and may worry others who like myelf are a little technically challenged Computerwise..
There is one niggle, my usual workflow was to edit the raw and produce one full size JPEG and one small one for Web usage. And I would email both to a Model.
The full size JPEG is now about 37MB ( very dependant on the detail in the image ). And I can not email it 
So I now convert it down using DPP4 to an additional 18MB file.
So edited storage implications are that one needs considerably more space
Definitely worth it - but significant.
Screen resolution.
Even with the 5D3 I felt an upgrade toma 4K screen would be a bonus.
This feeling is really confirmed with these files. I just dont think the 1920 x 1080p screen does it justice.
I trundled over to my rich friend who has a 27" 4K screen, and had a peak!
Wow I Really do like this camera!! ( for studio stuff )
TBH I found the 27" screen a bit overbearing. And will go the 24" route quite happily ( initially size was dictated because of budget constraints ). The other factor is my "editing office" is only 14' x 15', so its a relatively small room. And the wife does not want my stuff in the lounge.
IMO the detail really hits you in the face. I know everyone will paste me - "what do you want that for - only 5% of your pics will ever be made into big 60"x 45" prints etc!"
My answer, for viewing, and for editing - especially the latter - bye bye zooming in! 
I am happy to keep updating my findings about using this camera, but please take it as a non technical personal evaluation - and hope it might be useful for some considering it for Studio, and Landscapes.
