8-48mm Lens should Cover 1/2" (I Dont Own That Lens, just form Test images i have seen) Should work well for the 1.4 with higher Framerates, will Vignett on Full 1.4 Sensor. On the 2.1 i Would only Reccomend for VERY high Frame Rates (if Full Image With is not needed).
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12.5-75mm Fujinon will Cover 2/3" and is therefor a good fit for the 1.4. Will Vignet seriously on the 2.1!
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75mm Cosmicar will work well on Both, the 2.1 and 1.4 at any given Resolution.
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12.5 Should cover the 1.4 with no Problem, but will give quite some Vigneting and Black corners on the 2.1!