I'd say that this has happened with other reviews as well. I happen to have all 3 amigos and started up with FA 77, followed by 43 and then 31. FA 31 limited does have it's quirks which has lead to some users call it as 'Diva' and this is mostly because it can also deliver very beautiful images when it 'want'. This is not true completelly, because you can learn what does work and what does not (strenghts and weakness thing with this lens). But sometimes it's character does give that unique look we all know it produces. Most of it's 'faults' has been addressed with HD version while still having most of the character left.
I have SMC made in Japan version. And yes, it has it's character and is best seen when used with K-1(which I sold and am now using K-3III). I'm lusting after DFA 21 because it seems to have that magic even with K-3III what 31 has on K-1 AND can be used with that new K-1 which is hopefully coming also.
Compared to more modern lenses(like Sigma 35/1.4) this lens is not as uniform and predictable, especially if you shoot wide open. And these characteristics can lead to some one get very frustrated when they invest a lot of money to it. Honestly. While it can deliver very beautiful wide open images and it has character, just like your FA 43 does, but differently.
Then again, stopped down FA 31 compares quite well even with most recent lenses. Some people does say that this is not the reason why you buy f 1.8 lens.
( Actually for that reason you have DFA * 50 and * 85. )
you buy FA 31 limited for the whole image, not for pixel peep, especially when shooting wide open. I usually leave auto correction off at LR, because then it will look just like any other wide lens with out character.
That is my 2 cents.