There's two things I wonder about the coatings and one is resistance to flare. What I'm wondering also is if the older coating will effect colour temp. I'd prefer it if it was warmer...
Actually, I don't own the Summilux but am thinking of trading my Summicron towards it. I sent it away for my old boss at a camera store to DAG. At the end of the day I'd like the extra stop but am trying to consider the options, pros and cons. The Cron is the new version, black, and has the M8 bar code and had a recent CLA. The Lux was suffering from a really bad rear element separation that Don has apparently fixed, along with aperture blades that were a bit stiff. I guess there's always a problem with older lenses that this may happen again or to another group of elements. Can the older Lux get coded for M8?
A few things to consider.
Any more thoughts?