I have a black lamb a-2, lamb ma-1, and suiting wool ma-1. If i had to choose between keeping the a-2 or wool ma-1, the a-2 is a no brainer. Its versatile, classy, street, and adding the fur feels almost like you're getting 2 jackets in 1. If you can, get both.
That said, the suiting wool MA-1 is a much warmer jacket than I thought. It's actually warmer than my leathers.