I just bought a razor HD LHT in the last week. Compared that to a VX5 in the store. Obviously the optical quality is next to impossibly to differentiate in a store.
I really like the vortex reticle a lot more than basically any Leupold offering.
The "clicks" on the vortex are in a completely other league from Leupold. Vortex have great detent and are audible. The Leupold was super mushy. BIG difference there, although I will say that I like the Leupold zero stop system. Not that it's any better than vortex's, just something they did well.
I think the other big difference physically is tube size, with vortex being a 3m and Leupold being 34(?). Not a bid deal either way, really.
I don't regret my decision, just can't wait to get some field time behind it.