Ikegami announced that its new GFCAM HD camcorder for HD cinema production is equipped with a 4/3-inch optical format Aptina 4K (4096×2160) CMOS sensor. The camera uses both horizontal and vertical oversampling to improve MTF and and provides 24p/25p/30p native recording.
Update: The original Ikegami PR has been modified and references to Aptina sensor and Four-Thirds GFCAM have been removed. Still, the original text is temporarily kept in Google search and some other sites, like Consumer Electronics Net:
"Ikegami also addresses HD cinema production with the introduction of the new Four-Thirds GFCAM. Based on the workflow-efficient tapeless GFCAM HD Flash camcorder, the new camera is equipped with a 4/3-inch optical format Aptina 4K CMOS sensor for high resolution digital filmmaking. Providing excellent MTF both horizontally and vertically with over-sampling and 24p/25p/30p native recording, the camera uses lower-cost 64/128 GB Flash media that employs MLC (Multi Level Cell) technology with 10,000 times rewrite capacity. The new Four-Thirds GFCAM is designed to accept large format PL-Mount lenses for film-style high-aperture, shallow depth-of-focus cinematography."