Lightroom does a great job for Canon or Nikon RAW files.
Unfortunately it cannot handle Fujis X-Trans files properly. With increased sharpening there are lots of visible artifacts.
Detail is rendered worse than in nearly any other converter (Iridient, Capture One, Aperture ...)
The problem is also described here:
There are lot's of Fuji X shooters and there are more and more cameras with the XTrans sensor (XT-1, X100T, X30 ...).
Will there be an improvement in LR6?
No one can answer your question because no one can speak publically about what LR6 will or won’t do.