JOS
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About retrograde hand, I will say thats inevitable. If the hand is not long enough, people will then complain about where the hand is pointing.
Arranging all the necessary details on a dial (relatively small if you talk about PP) is always challenging. PP likes to strike a balance of classic and yet relevant. So, thats extremely challenging when it comes perp calender. Indeed, most of the perp. calender which is below 40mm has that kind of 'messy' and readable issue. Even big dial such as 46 or 48mm big pilot perp calender also people complain about 'messiness'.
So if you comparing with a few other models of PP perp. calender, i will say 5159 is one of the most beautiful perp. calender made by PP. You know what I mean if you comparing this with 3940p, 5140 etc. PP doesnt need everyone to like them. They do not really care really.
personally, i think this 5159 is the most beautiful and elegant perp. calender made by PP. of course that will be 5970 if one doesnt mind to have a chronograph.