The latest Canon now delivering 4K footage is available to hire from Vid4 the Canon XC10 offers a reasonably sized sensor and 4K footage.
Such an easy to use camera that has a fixed lens and is being presented by Canon as a second camera for the likes of the C300 and C100
Fitted with a 1" CMOS sensor recording up to 3840x2160 for UHDTV to CFast 2,0 cards at an incredible 305MBPS,and incorporating a fixed
27.3 - 273mm lens you can hire the Canon XC10 here
You can also check out this video demonstrating the ease of use and brilliant autofocus system in action.