I had one back in 2016, the single focus version. Glass was pristine but it didn't like certain taking lenses. With an helios it was a bloom fest up to f5.6/f8, with a zuiko 50mm stopped down to f2.8 it was a much better match with less halation and a crisp centre. The edges stayed somewhat soft though. It's a nice lens to play around with and very easy to work with but it isn't a lens for general anamorphic purpose since the look is very strong and the use is fairly limited. The plus side is the minimal focus distance of 0.5m without diopters. Unless you can get one for really cheap and do passion projects with it I wouldn't recommend this as your main anamorphot.
Some old baby isco footage I shot with the gh4, color grade was shit since I screwed up the WB.