Daisukiphoto blog wrapped up some sample photos of the Samyang (also known as Rokinon in US) 7.5mm Fisheye Lens. According to them the Samyang 7.5mm F3.5 Fisheye lens is quite competent and compares fairly well with the higher priced Panasonic 8mm fisheye lens.
They find its size to be quite portable and lightweight. The lens is available in two colors: silver or black. The only bad of the camera is that although the lens mount is native micro four thirds no chip exists so no EXIF data is recorded to camera.
The lens weighs 197 grams and provides a 180 degrees angle of view. Its optics are comprised of 9 elements in 7 groups and has a minimum aperture of F3.5 and maximum aperture of F22. The minimum focusing distance of the lens is of just 9 cm which means you can create some different photos than usual with this lens specially when up close. A good thing of the Samyang 7.5mm F3.5 fisheye lens for micro four thirds is that it comes with an integrated lens hood in order to have flare effects minimized.
Please find some of the photos available at Daisukiphoto of the Samyang 7.5mm F3.5 Fisheye Lens for Micro Four Thirds Compact System Cameras: