@ Dr Croubie - thanks for the detailed post.

I decided to take the plunge and see for myself which lens I like most. I picked up the 40mm locally and placed an order for the 85mm (should show up next week). Whichever I like least will go back.

I do have one additional pondering: 40mm versus Tamron 17-50mm. The Tamron runs about twice the price of the 40mm currently with rebate. That to me spells good value. Both are 2.8. So in theory if IQ is the same the Tamron should be a better option with the only negative the fact that it is bigger.
If I like the 40mm I may just order the Tamron to see how the two compare