Oly 12/2 is more expensive ($800 MSRP vs $400 for Samyang, although from time to time you can buy it with a camera for $600, including now), but it is also much smaller, lighter, has autofocus and electronics for automatic in-camera corrections of distortion, vignetting and on the latest cameras also CA).
If it were available for $600 without a camera, this Samyang would not have a chance… Well, on ebay used Oly 12mm go for as low as $467. This Samyand does not have chance. Maybe for poorer systems, but not for m43.
Samyang announces 12mm 1:2.0 NCS CS wideangle for mirrorless cameras
Posted by Chris Roubis on 21st, Mar, 2014
Source Article from http://www.dpreview.com/news/2014/03/21/samyang-announces-12mm-1-2-0-ncs-cs-wideangle-for-mirrorless
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.