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Your image clearly shows (as did one of bagginsbill's) that refraction can counter concavity. In fact I think there is too much refraction in the "Convex-with refraction" image, and that a real iris does not appear so close to the cornea. However I am still not convinced that there is any good reason to use a concave iris, when a real one is convex. I will stand to be corrected on this point, but I have not seen any convincing evidence so far. Cobaltdream posted some links to good photos of eyes, and seems to think they display deviance of a concave appearance. I look at those same photos and see nothing but evidence of a shape that is roughly a convex toroid.

You caught me right as I was about to go to bed. ;-)
Well I really wasn't trying to convince you of anything, just showing some results of experiments.
There's a good possibility the material I used was exaggerating the effect a bit because it also uses internal reflections, as well as refraction.

At any rate, it looks like the physical evidence is in, regarding the actual iris shape, so I would think the only thing left to do is to make sure Antonia has iris and pupil morphs to accommodate however people want to deal with it, either with refraction and raytracing or just morphs.