While my review of the 1.4x TC went online on launch day, October 21st 2015, it turned out that the quality did indeed vary significantly; it looks like that the installed lens firmware (1.0) of the borrowed unit, was of an earlier version and did not show the full potential of this new piece of photo-gear. One month later, I’m testing a production copy of the TC with the latest 50-140 1.10 lens firmware and have seen a large difference in the overall sharpness of the files. It is now superior to the one of the 55-200 lens…….

Source: bjornmoerman.blogspot.de
 

Fujifilm Fujinon XF50-140mm F2.8

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Björn Moerman reviews Teleconverter XF 1.4 TC