I am curious on the automatic application of the Lens correction profiles as at least with LR 5 and 4.4 no vignetting correction seems to be applied. I have worked several different series now taken the the 18-55 @ 18mm and most times no vignetting correction is being applied. With Canon and Nikon lens if you pick the specific lens and use the auto function a vignetting correction is also applied (not always perfect but at least a start) along with distortion.
Also LR lists the Fuji X-100, with it's fixed lens, which is why I assumed that LR only had worked up profiles for the X-100, and non of the X-1pro etc and lenses. Looking back on Capture one work, I do notice on the same file less vignetting so it must be seeing something.
Curious also what the Fuji meta has that LR sees, which is different than say a Canon or Nikon as they also write all the lens info to the metadata. Tried to google this, but came up empty.
I have never looked into the actual values in the metadata. I have compared the images before and after lens correction by using dcraw and comparing with lightroom. There is a difference and it is slight on on the vignette correction. I believe that Eric Chan stated in the LuLa video that was the update to the LR4 videos that they do apply the data but maybe not full strength. I am pretty sure that is what I remember I will have to go back and look. Vignetting is easy to correct using ACR or LR and also C1.
I don't believe that Canon and Nikon write lens correction information, they have data about the lens settings and focus point but not correction. Olympus is one that writes the data and Eric mentioned that as well in the video interview.