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Have you tried the Lumix 7-14?
The Samyang is a good option; also possibly consider something like an Opteka or Century 0.3-4 screw-on fisheye adapter as originally intended for video camera applications... fit in on however fast a wide-ish lens you want, then (ie, Voigt 25/0.95 x 0.3 = ~8/0.95 fisheye)