Please, mrsfotografie, tell me why are you not happy with the Rokinon 12 mm f/2.0?
It is supposed to be of very high optical quality and reasonably priced. In fact, I though I might actually get one.
As you said, there is so much more tempting stuff from Canon for the EF that you'd really have to be a Sony fanatic to buy a Zeiss Touit or whatever for 1000 dollars when you can get a 16-35 f/4 at that price and it is quand meme something else, totally. Value is something where Sony is seriously lagging behind.
martti, the 12mm is a very good optic and lives up to its reputation, there's some CA but that's easily corrected. Reason for selling it would be that it is a pain to correctly focus manually, even with focus peaking enabled and especially when stopped down. The focus peaking does not clearly enough identify what is in focus and what is not, when dealing with such a short focal length. This is not really a problem in itself because you can check the result on the screen or in the viewfinder, but it means that shooting with this lens is cumbersome if you want to shoot fast and move on. I don't see myself using this lens if I would have the zoom because the times when I need a fast aperture in such a wide angle lens are fairly limited (and for low light use I'd be shooting with my 5DMkIII anyway).
And yes I totally agree the Sony lenses are overpriced. I have the 16-70mm but comparing it to my 24-105L (size, weathersealing), the price just isn't right. The 10-18 is also a pricey piece of glass. And as for those Touit's, something like that deserves a full frame sensor.