Just ordered a pair of Atma-Sphere MK II.3 monos

I had no real way to demo them so took a chance based on the general approval of individual users and I hesitate to say the much reviled "audio magazine reviews". They should be delivered next week. I will be powering a pair of Silverline Sonatas. I am currently using a pair of Manley 120 monoblocks using EH KT90 tubes.

What can I expect from the in the sonic performance of these versus push-pull tubes?