is there a FF equivalent for samyang 8mm?

I recently added a 5D II to my 7D. My intent is to keep both a FF and crop body, as I sometimes benefit from carrying both on trips and together they provide a much diverse use for my lenses

I am in the process of replacing my crop only lenses with FF lenses, so that I can use them on both bodies

• sigma 30/1.4 -> canon 28/1.8 (i find them similar, while going wider on FF when I want to)

• sigma 10-20 -> 17-40 L (about to do this, want to keep the field of view)

The tricky one is samyang 8mm fisheye. I use it occasionally and like it when I do. It's wide, sharp enough and have a somewhat unique stereographic projection - somewhere between a usual fisheye and rectilenier
Is there a FF equivalent to this lens. Similar FOV and projection?

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