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I found the PP a bit more "formal" and the Langematik more daily wearable......anyway, there is nothing more attractive than Lange's Big Date.............:-) 
 
Oh yes there is. The RG lange 1 moonphase. By the way I do agree with you. I have the calatrava same face different bezel. the 5107 with the 5117 face and yes it seems more formal