I've always found that third stop jumps need more than just exposure adjustment. It is possible so long as there's no clipping, one big advantage of ETTR is fine control over this, but I have to tweak the contrast too to get a unable shot, and I've not found anything that can automate this.
If we can capture 2144x1076 25 times a sec, and we can dolly this around with digital dolly, then in theory it would be possible to capture the whole raw frame at speeds like 1fps, but with some very odd shutter effects. If you could minimise these and combine it with fine exposure control and ETTR, you'd have a unique tool for timelapse. The 5D3 might be even more impressive!