All three suffer from the same droopy subdials. Lange movement is a little above Patek, but certainly not by a lot. Case work on 5170 is a little simple for me. The 5172 is brilliant, not just the triple-stepped lugs, also the sides are more complex then ...
I looked very closely at the Lange 1815 chrono (early and current versions) but couldn't love the case nor dial. The 5170 (breguet numerals) won easily in those areas. I thought the 5172 dial was unnecessarily large and thought that size might not age wel...