Regarding the coating: As I said I do not have a SWC myself, but from my experience with other lenses, the single coating is already very good. Iīm amazed by the colour fidelity of my single coated 50/4 Distagon and it has 14 lens elements I think. The Biogon has only 6. So I donīt think it is a problem either, as long as you do not shoot straight into the sun. And from my own experience with other lenses: If you do that, T* wonīt help you either.
6 elements? I think not. The 38/4.5 Biogon conforms to US Patent 2,721,499. 8 elements in 5 groups.