I enjoyed my Samyang 14mm for a couple shots at the zoo today. It takes a little getting used to MF without focus confirmation but I'm happy I get the benefits from the precision matte focus screen in my 5DmkII. I found it's easiest to focus wide open, then stop down (like canon AF works).
Because in several reviews it was mentioned that infinity was not at the infinity focus mark, I did a quick test to confirm this and happy to report my focus scale is OK! I also noticed the infinity mark on my my focus scale is in a different position and has a leader, other than the one on Photozone. Looks like Samyang does silent updates
Shooting into the sun there was significant lens flare shooting wide open, but it immediately disappeared when slightly stopping down the diaphragm. I kinda like this sun burst effect though.
Sun shot and focus test:
First shot: at infinity, f/2.8
Second shot: at ~1m, f/2.8
As said before, the lens flare disappeared when stopping down.
All in all, great colors and I love the creative potential for this lens.