What an interesting acquisition! I've been enjoying the 1DC for over a year now and I've not seen anything from the FS7 that comes close. With your technical knowledge, can you tell me why the 1DC can't be updated/hacked to allow a 4k output? At the moment I'm using the Ninjablade for HD, which is the best I've seen from a DSLR when you use the internal 4k 25P setting, outputting HD, and 4k when I have more time/budget allowance. Look forward to seeing your tests.