Quality question: processing & rust protection W124 vs. W140

Hello dear S class forum, after Blaubär has opened a thread about the quality of the Mercedes parts, I would like to open at this point a collection thread for quality comparison between W124 and W140. It is clear to me that the S class is more complex. Therefore, I am more interested in the processing, and above all the corrosion resistance. From 93 the sheet metal quality at MB has become bad, C classes rust like sow, E class rust something, but the W140 supposedly rusts also The comparison is therefore essentially W124 Mopf 2 vs W140 Mopf 1 What really looks like? I look forward to reports and hope for active participation! Best greeting Justus