I had a 1075 (I think) and a Khatargo. The Rotel has a much more relax character, while Odyssey is much more neutral, in my opinion, even a bit bright depending on how you perceive the extended, airy, highs. They take longer to break in before the top end smooths out. I wouldn't call it a "serious" step up although the sound is a bit more open, but there are a lot of other Odyssey fans that will tell you otherwise.
Odyssey amps are heavy (as marketed on their website), but part of that reason is their ginormous aluminum faceplates.
Odyssey amps are heavy (as marketed on their website), but part of that reason is their ginormous aluminum faceplates.