Totally agree to name the 5050 as the best pp retrograde calendar ever!
The only question that I have is: with roman numerals on the dial or with indeces?
For me: both are to die for.
The current 5159 IS nice, no doubt.
Also in the ueber-garnished version as 5160.
Never tried it on but I trust it will get away with a bit more chunkyness and presence, in particular if it is the WG version.
Indeed: 3940, 5140 and the 5050ies are the only grand complications out there that are really wearable.
Best
Moritz



