GAH! No, space opera is not necessarily space fantasy. Revelation Space could even be considered Hard SF, and it is a space opera. Leviathan Wakes is most certainly not fantasy in space either.
Sorry for the rant, but when someone says something like that it just irritates the heck out of me, because I myself write fairly realistic space opera. It's a quite diverse subgenre, actually.
As for the OP... Leviathan Wakes is decent (I'm sure I'll get called out for saying that, but I enjoyed it, and people who like space opera will probably enjoy it as well.)
To be fair, Mouse has read the WIP in question and was commenting on that particular book - which is definitely space fantasy. I've read a lot of space opera, across a wide range, and mine is definitely at the fantasy end. Anyway, any spring to mind - character-led, elements of fantasy as well as sci fi?