Atma-sphere MP-1 or MP-3 What are the sonic diffs

I'm using M-60 Mk 2.3 with full upgrades and 91db horn speakers. My question is what and how strong is the difference sound wise between fully upgraded versions of these two preamps. I play 80% vinyl and use MC cartridge. Thanks!
The MP-1 is going to be more resolving with a lower noise floor...thus creating a larger and more refined/detailed image.

People pay a large premium for a relatively small perceived difference.

Dollar value of the performance improvement is a judgment call that only you can make.
A recent thread in the Amps/Preamps forum includes comments on both the MP-1 and MP-3. You can find it here: Atma-Sphere MA-1 amps.

There are fairly significant differences in circuit and parts that account for the difference in cost.
Thanks for both responses. The thread Jtimothya listed was a particular help.