I have been internet searching about Panasonic's relationship with Leica as it relates to lenses. There are many different postings about this on many blogs and forums and a lot of the information is conflicting. Does Leica design the lenses for Panasonic to manufacture? Or, is this a full-on Leica product with Panasonic branding? I've also read on a few forum posts that Leica simply blesses Panasonic's design and QC with their name. Thanks!