I have the Samyang 14mm (also goes by Rokinon, Bower, Pro-Optic, Walimex...The Samyang brand cost a little more than the other brands) and it's sharp. And I mean tack sharp. I literally can read with no problem the fine print on the sides of cereal boxes at 15 plus feet when the image is zoomed in close. Sure, it's manual focus but I use it solely for landscape photography at f/16 on a sturdy Gitzo tripod so it's not an issue one bit. I simply focus using Live View at 10x and it would nailed the focus every time. I've recently installed an AF confirm chip to get correct EXIF info (quite easy to do once you'd figured it out). The only gripe I have is that the lens doesn't take filters, either on the front or rear (so the Lee Filter System and handholding filters are out of the question, although I've successfully added a homemade magnetic cutout nd filter gel on the lens back). I've looked at both the 14L II and Zeiss 15mm/18mm UW lenses (although I do love the look of the Zeiss 21mm) and this by far is the best bang for the buck with fabulous high image quality.
