So for me, I went from a Vortex Viper HD to this Athlon Ares (both 15-45x65) and the first test I ran on them side by side in the evening I found the Athlon to be more clear and bright in low light than the Vortex. The caveat here being my comparison was against the viper not the Razor. For me it was an upgrade in every aspect... However, I have yet to sit down and run the same tests or comps against a razor.
I think for me where I found value was that for the price range the Vortex Viper runs in, I could get a spotter that was higher performing. From that perspective it's been a win for me and has proven true. I bought my Athlon for the same price I sold a 2 year old Viper for.
That all said, I will be able to run a side by side comparison on the Ares and the Razor in Mid March, and I'm happy to post up pics of a side by side comp then.