IIRC the Z6 2-12x50 was $2399 and the VX6 was $1199 with the B&C reticle. Omineca Source for Sports gave me a good deal on the VX6, so I paid a bit less. So basically you are looking at 1/2 price.
I had a $1950 budget, and I bought the VX6, which was obviously well under what I could have spent. I really, really strongly considered the S&B 3-12x42 at $1450 from Wolverine, but two things caused me concern.
The first was that I simply had no chance to look at the S&B and compare the optics to the Leupold. I know that with S&B you will get 100% top notch, but the Z6 is no slouch and really I could not see much, if any difference when I looked at the Z6 and VX6. Keep in mind that your eyes may be different than mine.
The other thing I liked about the VX6 was the CDS turret, especially compared to the S&B Klassik wich does not even have numbers to mark the adjustments on the turret.
To me the Conquest was not in the running. I owned a Conquest once, but don't own one now to do a side by side comparison. I got rid of the Conquest for a Swarovski AV, which was much nicer. Optically the VX6 is superior to my Swarovski AV.The eyebox is also MUCH better than anything I have ever used.
Like I said, I had cash in hand for a much more expensive scope, and I bought the VX6.