Lange is $51,500 and this is $39,800 - that is a big price difference. If you mean "I would prefer a Lange 1815 second hand used" - well then we have to compare to what this goes for used as well. We are in an era where, for watches like this, steel is the most precious metal of them all! I do agree
I agree with your praise and description of the importance of the 5050. My collection will always have one. To me one of the most important Pateks ever made, and yet so under appreciated at the moment which makes it even more charming to me.
The solid platinum hinge back is tremendous. The movement is the same thickness of course as the Patek 5970P but this piece "Feels more substantial" on the wrist thanks to the hinge back. I love that aspect of it!