IWC Mark XX vs XViii

[rockysw]

Anyone have both IWC Mark XViii and XX (or had them at some point).

I am very keen on the mark series (black dial) but unsure between the two. Mark XViii is all matte finish (including hands and bracelet), XX has some shiny parts along with longer power reserve and quick exchange.

At fist instance I like the XViii more but my concern is that I will get bored of it quickly where as XX has some interesting elements (along with quick change which should keep things interesting).

So a long term review of either (or both) would be very helpful.

Thanks!