Thank you for your interesting account. Personally, in my working days in the Micrographic industry, I had the opportunity to visit Leica's Singapore factory and I was impresssed with their precision especially when a lens' drawing needed to be printed by the microfilm enlarger printed I was selling. Microfilm resolution at 240LP/mm for drawings way surpassed today's Zeiss lens(ZE 50f1.4) resolving power of only 45LP/mm. To make an A0 or A1 size print from such high resolution microfilm was no easy task and by golly how stringent they were. So I understand why a Leica lens is so good even by today's standard.