I've got a Fuji camera (Xm1) that I'd like to sort out with a new prime lens - cos it only came with a kit short zoom lens when I "acquired" it

I've seen two that I'm confused about ... maybe they're just two very similar one designs , but I'm not why they would be so close - maybe it's just something I'm missing

1st is a 10mm/F2.8 http://www.samyang-lens.co.uk/samyan...s-cs-lens.html

2nd is a 12mm/F2.0 http://www.samyang-lens.co.uk/samyan...-ncs-lens.html

Apart from the F difference, how much different will these two be ?

and neither are fisheye are they ?, cos they do a 8mm described as a fisheye http://www.samyang-lens.co.uk/samyan...heye-lens.html (and I don't really want a fisheye, I just want a good wideangle)

Any advice would be gratefully accepted - I can get either at £230 ish