I can't comment on the Conquest V6, however I can compare the Diavari to a Luepold VX-6 (not HD).
I have a Diavari 6-24x56, its pretty much the best glass I have ever used, especially in low light, as you probably know.
I have a Leupold 3-18x50 VX 6 and it is very, very, close to the Diavari, to my eyes. It is definitely in the same ballpark glass wise, which is something I was not expecting to ever say about Leupold. Love that scope and it is now my main hunting scope. It is much lighter, has zero lock, illuminated fire dot wind plex is perfect, tracks dead on.
I'm jealous of you though, always wished I had the 4-16x50 Diavari instead of the 6-24x56 because of weight and size.