Oh, I just saw you changed your post. The original post said you were about to bid on the MC303.
I can only theorize on what the sound of the Krell 7200 vs MC303 is going to be.
Based on what I have read and what I know about Krell, the Krell 7200 is --probably-- going to be a lot more detailed and fast when compared to the MC303.
The MC303 is going to have a lot more brute force which means stronger bass and midbass -- as well as fuller midrange. It will probably be more laid back than the Krell, but as I have not heard either amp I cannot be sure.
It would actually be a hard choice for me. It's strange, but I might actually lean towards the MC303 because of the size of the power supply and the overall capability of the amp. The Krell actually runs out of power and can't drive all channels at 200 watts. You only get about 150 watts with all channels driven.