I was in Bass Pro the other day looking through scopes. I realize this is not a "real world" hunting comparison, but I looked through each scope to the same distant dark ceiling corner of the building. I looked at comparable scopes in the 4.5-14x40 (some were 44 mm) range and was amazed at the differences. The Ziess Conquest was significantly brighter and clearer than the VXIII, which was significantly better than the VXII. The Nikon Buckmaster (I think it was a Buckmaster) was about the same as the VXII. The Burris Fullfield was also in the same ballpark as the VXII. Again, this was to my aging 49 year old eyes, not a scientific comparison.
If you are looking to spend enough to get a VXIII, I would take the Ziess home instead in a heartbeat. I liked the reticle in the Ziess over all the others also.
Before you plunk down a good sized chunk of change, I would highly recommend that you do a similar comparison at Bass Pro or Cabela's or Gander Mountain, etc. What is most important is your personal view through a scope, not what me or anyone else tells you.