Colin,
Can't say much about comparisons between lenses.
Samyang/Rokinon/Bower 135mm f2 are all the same lens badged differently.
B&H Photo in New York sells these lenses at a decent discount. I bought a Rokinon 135mm f2 a couple of weeks ago for USD450 + USD26 postage. That special has expired but they are still available at USD550
Haven't had a chance to try the lens for AP yet. Seems sharp for terrestrial. Will post some images when I get a chance.
Joe
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