The new WA-Digaron-lenses are (weak) retrofocus-designs, the number of elements/groups already shows how difficult those lenses are to design/assemble. A Summilux 24mm also costs twice as much as a 50mm...
As long as your MFDB (or you're shooting film) can deal with more oblique light rays, classic, symmetrical designs are still the best choice (despite vignetting).