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Maybe I need to play a bit more but it doesn't appear to be as sharp wide open as my 55FE on my Sony A7R.
That is in part because the 55 FE is one of the best lenses made, short of the $4000 Opus, so its pretty hard to find many lens that will compare to it, plus, its on a 36meg sensor with no AA filter, which gives some pretty biting sharpness as long as the lens is up to it (which the 55 FE is)
Plus, I'm sure there are some optical trade-offs to get the f1.2 speed, while the 55 only had to be f1.8.
Compared to lens like my FD 55 1.2 or my MC Rokkor 58 1.2, the Fuji 56/1.2 is amazingly good wide open. I wish those old legacy lenses could come even halfway to how good the Fuji does at f1.2