Ever since the 5D Mark ii I have personally awaited an even loftier film and Red One competitor for the prosumer market, and with the new 1Dc Canon has done just that. Forget the Nikon D800 or Canon 5D Mark iii, this Canon 1Dc beast blows them all out of the water for shooting video.
You can see from the photo that it is presented in a camera body any photography is familiar with, especially photographers and videographers who have been using DSLRs for the past decade.
The truth of the matter is that DSLRs are consumer cameras, as 35mm film SLRs were always consumer cameras. Sure, they are capable of capturing beautiful images; colors, composition, depth of field, the 35mm format as captured by SLR cameras is wonderful. APS-C film and digital SLRs have and always been even more so aimed at the consumer market, and the quality of the images is never really as good as true full frame digital or film, not to mention larger formats. On the contrary, the 1Dc seems like a piece of pro equipment.
Why 4K takes us closer to film
A real 35mm film frame is 36x24mm, using the entire frame to record, an equivalent of more than a 4,000 x 2,000 pixel image (some anamorphic film frames like S35 crop the bottom and top of the image for a wider frame).
The full HD frame size that all consumer video cameras shoot at now is 1920x1080, so basically the 4K images is twice the size, twice the resolution. The 1080p format is a compressed format.
Of course a film with great acting, lighting and directing could be shot on the 5D Mark ii and make it easily into theaters. There's nothing wrong with 1080p, especially if care is taken to capture beautiful video. As far as getting a true "film look" 4K takes you there. The 1Dc should take you there.
The only caveat is the price for now. The 1Dc starts at 15k for the body, putting it in direct competition to its cousin the Canon C300 and the Red One Scarlet. The genius thing that Canon did was provide us with a camera body that shoots 4K video with an EF mount. This means you can take your wonderfully sharp $100 Canon EF 50mm f1.8 and start shooting beautiful 4K video.