In the 5D Mkiv's defence all its peers have similar issues with rolling shutter. The smaller formats are better eg gh4. (not that the gh4 is much smaller @4k - 1.7 vs 2.3 crop)
It's kinda like that are all using much the same technology and have similar cost constraints...
Yesterday I learnt that the Canon has not 1.7 crop but more like 2.0 because the (highly compressed) video proportion is not 16:9 - but honestly, I don't know much more about video than "I prefer to leave that to other people".
And just now I learnt the SD card is UHS I standard. That's why Nikon's manager yell around while partying.
Well, I better don't take the mouth to full. Maybe I get the X-T2 next week, then I can try about the "rollin', rollin', rollin..." shutter of it.
somewhat jealous of your imminent arrival of the fuji. If the autofocus lives up to the hype its going to be popular.
the software situation with the Foveon sensors is not ideal. Could you run a VM on your mac to do the raw conversion? (not that this isn't sucky as well)
For me the 16 Mpix images from my x100t are fine for 1m wide prints, so i'm not too worried about resolution, however the greater color information from the Sigma is appealing.