Hi Bentraje,
I use very sporadically (once a year or less) Cinema 4D R20 (exporting DXF from MicroStation) for additional mesh modelling and basic architectural rendering in Maxwell Render or Octane. Subscription would be waste of money for me. I just need to upgrade to R21 (or higher) for 4K resolution on my monitor (R20 has blurry interface on 4K PC). I thought that I can do it anytime but I found out there is no more perpetual license from this year so I am trying to catch one before is to late.