Upgrading from 5DIII to 5DIV -- your probable reasons?

[Michael Clark]

...Well here goes:

...High seed sec for shutter. 1/250th at least...latest and greatest, if not better, live view focusing via sensor...1dX level weather sealing...The 5D should just be a smaller 1dx when it comes to weather sealing...have the 1Dx and the 5ds/r's image based intelligent tracking sensor that uses the dedicated processor...1 cfast and 1 Cf...

...I think that covers it.

Sounds like you are expecting to get a 1DxII for the price of a 5D IV. I think you will be disappointed.

The 7D Mark II has many of those features. Even the x0D bodies now get the DPAF in LV, so it's a lock the 5DIV will have it. Roger Cicala said the 7DII was by far the best weather sealed camera he's ever taken apart (which would include any 1-series body up to and including the 1D X). The 7DII has iTR and I think we'd all be shocked if the 5DIV doesn't. Again, even the x0D bodies and maybe even the latest Rebels are getting RGB+ir metering even if they are not getting the extra processing power to use it for iTR. The 5DIV will likely have one CFast and one (non-crippled) SD slot.

So that leaves an x-sync of 1/250 vs. the current 1/200. 1/3 stop faster flash sync is "expecting too much?"