Vic,

> And I also assume that the 50mm f/1.4 M and A are optically identical?

I have four M-50/1.4 and two A-50/1.4 (you can never have enough 
fifties). Here's a summary of my findings:

M:
- better bokeh
- better build quality

A:
- better sharpness from 1.4 to 2.8
- perhaps slightly higher contrast (different coatings)
- full support for digital SLRs (except AF, of course)

you may already guessed which one I prefer from the numbers above. :-) 
Nevertheless the (optical) differences are very small and you can't go 
wrong with either.

Cheers,

Peter

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