[toni-a]

Well, the Sigma is cheap n cheerful.

The samyang was sold, remains Sony28mmf2.0 it's really cheap (100EUR) will check condition, and keep an eye on Sigma 30mmf1.4 if anyone is going to pop up.
Lately all the ones listed were at least double the price of Sony.... Qatar is a tiny country with a very small market, products that have low demand tend to sell dirt cheap...
I guess it's one of the rare places in the world where you could have two identical products with more than 50% price difference.
Nissan Xtrail has a clone called Renault Koleos, sharing the same guts (engine, gearbox, suspension etc ) with minor esthetic changes, on the used market usually a Nissan X trail with identical specs is at least 50% more expensive !!!