You're talking about a camera (5D4) that is not even at the horizon although some talk about a potential announcement in 2015.
Canons Camera Division Executive Masaya Maeda has twice confirmed that a new high megapixel camera is coming soon. He mentioned it the first time back in SEP 2014.
DEC 14, 2014 he said: "We are thinking of a high pixel count cameras for users who want high resolution images, and it will come out soon. It will retain pixel quality while increasing pixel count.
No one here knows. So why ask?
Why answer, when you are not following the announcements from Canon?
Even if we do not know exactly what this camera will look like it would be rushing it to buy a Canon camera right now unless you absolutely need it or can exclude that you would be interested in Canon's soon-to-come-according-to-Canon-mangement DSLR.
This new DSLR will hopefully at least catch up with the substantial advances that Nikon has made since the 5DIII came out. And why should we not expect Canons newest DSLR will be better than anything Nikon has out there already?
If nothing else a new release will certainly lower Canon 5DIII prices even more.
Time from presentation to market is only a few weeks for new Canon DSLRs, so with any luck the new camera will hit stores in April if launched at the same photo show as the 5DIII was 3 years ago (guessing here).
Yes that .
Also, the old adage works, good things come to those who wait.
Technology almost always gets better.... so does IQ
Prices on current gear (excluding exceptions) always goes down.
So it makes sense to wait..... unless:
There is a definite need with a financial Impact. At the end of the day this decision will be driven by your patience, and if you are looking for confirmation then here is it from me:
Wait for the 5d4 or even a year longer for the 6D2.