After shooting nearly two weeks with the $369 USD 7artisans 1.1/50mm leica M mount lens, I give my thoughts on the lens along with RAW files for you to download.
The lens is soft wide open at 1.1 but this is not really a surprise. Most big aperture lenses are soft wide open, this lens is a little more soft wide open than you will see with a Zeiss, Leica, or Canon. It is a compact, light weight lens that offers big aperture for little money (relatively speaking). The focus through has a little bit of play in when switching directions with the focus ring. It is enough for me to notice but not enough for me to be angry about (see low price above).
All in all, it delivers good images in most situations and would make a great first fast 50mm for those who are not afraid of manual focus. If you already own a Voigtlander Nokton or Mitakon (Zhongyi) Speedmaster 0.95/50mm, you don't need to trade your lens in. I would take both of those lenses over the 7artisans.