User blog comment:Harbumz/Introducing Vignette, Wikia's New Thumbnailer/@comment-24.99.151.27-20150212012017/@comment-25861950-20150212013342

"Today, users shouldn’t see anything different with the images they view on their articles or file pages than they saw last year. The thumbnail quality is just the same as it was on the old thumbnailer."

Shouldn't be, there is not supposed to be any noticeable difference, except (perhaps) an infinitismal increase in the speed of loading pages with thumbnails.