35/2 ZM v/s 35/2 Contax G

[semilog]

Very interesting. Almost could be the same lens.

Well, bear in mind that the cheapest 50/1.8 DG designs found on generic SLRs have cross sections that look at least as similar to a pre-ASPH 50 Summilux. Little differences (especially tight assembly tolerances) can have big effects.