I have never used my 24 tse wider than F11 and can't really imagine a need to so if you are budget minded and need to go with the samyung over the canon I'm not sure if this is much of an issue.
It's a very specialized lens, designed for architectural purposes which require large depths of field. If your needs are more general purpose the the 24mm prime is much more appropriate.
Sorry, but do you know what you are talking about?
Yes, the "shift" part of the lens is often used as you describe. Any clue what the tilt is used for? Hint: sharpness is VERY important when playing with DOF, and guess what the tilt function is used for?
Bottom line is you get what you pay for. Go cheap and it won't be top quality. Another route is a used 24mm ts version 1. I picked one up last year for 800.00 to hold me over til I can afford the version 2. It's still a serviceable lens.
Hehehehehehe. Price does sometimes relate to quality, but to say that price is the ONLY bearing on quality means you've wasted alot of money in your life.
FWIW I'm dissapointed in Samyang on this one. They had a wonderful opportunity to produce something that kicked the pants off Canon and they blew it, this time. A shame. Fortunately the others 3rd party makers are doing a good job of it.
Samyang DOES make some great stuff. Have been playing with my 8mm and it is a DREAM to use!