Shall we start a third thread for the 12/1.4 since the second one has been - just as I predicted - locked after having devolved into chaos? 
(actually, on one of the forums I used to hang out, there was an euphemism for locking the threads: *CLICK*, as in a moderator pushing the "Lock" button. 
)
But speaking of the lens at hand, if I had been into the long teles AND mirrorless, I might've looked at another 100-400 instead: the Fuji one. The results seem a lot more harmonious there (at least from the Lenstip tests).
(actually, on one of the forums I used to hang out, there was an euphemism for locking the threads: *CLICK*, as in a moderator pushing the "Lock" button. )But speaking of the lens at hand, if I had been into the long teles AND mirrorless, I might've looked at another 100-400 instead: the Fuji one. The results seem a lot more harmonious there (at least from the Lenstip tests).