Well... yes... the MA8950 appears to be a great integrated amp... but... "there’s always a but"... it is a very, very sophisticated integrated amp... with lots of circuitry and a sophisticated DAC... and comes at a premium price for all of that. Plus it’s all SS design.
The MA352 on the other hand is less sophisticated, includes no DAC, but has a tube preamp / buffer that adds a great touch to the sound quality... and... costs a bit less.
If you want a little more flexibility in your sound quality - the MA352 might be a good option - you can try various DAC’s and tubes to see what sounds best to you... and it still has enough power to drive most speakers. It sounds especially good with Harbeths!
As far as Hegel H390 or H590 - yes they’re great, but may be too much of a change from the McIntosh sound. And... again the DAC is included, and while it’s very good in the H590... and... part of the bargain - I think I’d prefer saving the money and picking my own preference in DAC’s. The primary reason I got the H590 was because it sounds great with Harbeths and is what they demo their amps with at shows.
If you’ve loved the McIntosh sound... you might think about sticking with it... with the MA352, unless they've got another tube / SS hybrid amp a step up from the MA352.
Just a thought...