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First of all, some lenses aren't compatible with the new 1.4 III, so make sure you aren't affected if you're considering that one
The 1.4 II vs III performance difference varies depending on the lens you use it on. It ranges from very noticeable to hardly at all. It makes a bigger difference on the newer long primes compared to older lenses.
Unless there is a significant price difference, or you can't use it on your intended lens, I'd just get the III.
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