It's going to be tough to find a 50mm lens to match every facet of the version IV 35mm Summicron.
The first part, finding a 50 with mediocre performance wide open, won't be too difficult; a collapsible Summicron with the ubiquitous "cleaning marks," or a Jupiter-8 with an out-of-whack focus cam should do the trick. The second part, paying $1,200 or more for $300 worth of performance, will be tough. Even the most devilish of ebay sellers doesn't have the huevos to post a four digit "buy-it-now" price for those lenses. And, lastly, you'll have to have a catch-phrase that appeals to the herd mentality of the internet age. "King of Bokeh" has a big head start, but lacks pizzaz, so there's room for competition. Alliteration always helps, though. I'm going to start calling my pre-aspherical Summilux 35 the "Queen of Coma" in every relevant internet post I can in hopes of de-throning the 'King.' 😀