how different is this lens to their 8mm fisheye they make for other dSLRs? I'll assume its smaller and lighter? I'd have thought a Nikon mount 8mm version would have the appeal of future flexibility, with just weight and size as its only downside. Or am I missing something here?

Would be nice to compare with the panasonic.
I compared the panasonic with olympus 4/3 and the panasonic was wide open quit a bit sharper.
So if someone lives near Rotterdam with this Samyang? ;)

Oh Sam-Zeiss. I like silver too.

Delta company, the exclusive representative and distributor of Samyang Optics in Europe, is proud to report that the lens announced in March, Samyang 7.5mm 1:3.5 UMC Fish-eye MFT will be available from the middle of September this year. The lens will be available in two colour versions: silver and black. Estimated retail price is EUR 299.

Panoramic photography with Samyang fish-eye lens
Samyang 7.5mm 1:3.5 UMC Fish-eye MFT offers an exceptionally wide angle of view, up to 180 degrees diagonally, which makes it a very useful tool for making panoramic photographs. You can enjoy the example panoramic photos in the form of a virtual tour around Krakow on our specially created website: www.samyang.pl/75mft All these panoramic photographs were taken with Samyang 7.5mm 1:3.5 Fish-eye UMC MFT and PEN Olympus E-P1.

Samyang 7.5mm 1:3.5 UMC Fish-eye MFT is an ultra-wide-angle manual lens with 7.5 millimetre focal length and 1:3.5 aperture ratio, providing 180 degree angle of view. Despite its small size, the new Samyang successfully combines the best features of the popular model with 8 mm focal length offering highest quality optics closed in a compact and visually attractive casing. Samyang 7.5mm 1:3.5 UMC Fish-eye MFT is the first model from the new family of lenses developed specifically for Micro Four Thirds system.Samyang Optics is proud to inform about the upcoming release of the new Samyang lens 24mm f/1.4 ED AS UMC.

Looking good, very acused perspective