Atma-Sphere MP-1 and MP-3 comparison

Hello,
I know this topic has been spoke of before, but after reading the various brief and vague posts, I have been left wanting...

So I employ those who have directly compared/contrasted the Atma-Sphere MP1 and MP3 preamps. Please give a review of what you liked and disliked, what you heard and how you would describe it; primarily focussing on what you found similar and dissimilar directly between the two.

Of course, we understand the MP1 is the senior, but how close (or not) does the MP3 come...

Thanks