First at all, this is a Canon forum. Go to nikon forum. Topics related to Samyang :
http://forum.nikon.org.pl/showthread.php?t=93624
http://forum.nikon.org.pl/showthread.php?t=106134

Secondly, all the people think that Samyang has the best optic construction and results (especially high quality in the corners) (except Canon's fisheye of course ). Combined with it's astonishingly low price, it's the best choice for amatour shooter.

Happy to see foreigners on our forum,
Michael.