This is what the Sony FS700 has to offer for $8000 but 4k would come as a firmware upgrade that has to be purchased.
This is what u get for the price......
ISO 500 (0 dB) to ISO 16,000 (30 dB) sensitivity
Cranks from 1 to 960 fps for fast motion to super-slow motion
Four ND filter levels: clear, 2, 4 & 6 stops
Four HyperGamma settings (same as F3)
WorldCam 50/60Hz systems
Exmor Super 35mm sensor 11.6-megapixles
Effective pixels (photo): approx. 8,400,000 pixels (16:9) or approx. 7,100,000 pixels (4:3)
Low aliasing (grossly over sampled HD)
Runs cool, no grain and no fan noise
Large buttons and switches with orange backgrounds for easy auto/manual distinction
Arri Rossette with micro-adjusting (for connecting grips, etc.)
Face detection
Auto/manual iris and focus with Sony lenses (lenses sold separately)
Features dual XLR inputs, a DC input, an FMU port for flash memory unit, SD / MemoryStick card slot, BNC connector
and HDMI output
Removable grip features four easy-to-use buttons including Start/Stop, Photo, 4x/8x expandable focus and push-button auto iris
Display offers video/film selections for distance (meters/feet), sensitivity (dB gain/ ISO) and shutter (speed/angle)
BNC connector offers 3G/HD-SDI and a planned future firmware upgrade will enable 4K data-stream output
Camera supports 1920 x 1080/60p full HD recording and still image capture