(I prefer native/smart lenses most times - adapted cons: size, weight, not connected to camera brain - focus speed / exif/ stabilization, etc. Though I do mess around with an old Zeiss Jena 58/2 Biotar and the new TTArtisans 75/1.5 Biotar clone, in particular.)
For CV 28mm, you will soon have 2 choices with different looks wide-open, the 1.5 and f/2 APO which should be delivering in the next couple of months. The 1.5 is a Marmite lens, so check out the APO, too.