I haven't tried a new VXIII, so I can't really compare it to what I have. However, I have a VXII 3X9, Sightron 6X24 and a Zeiss Conquest 3X9.
I would place the Zeiss at the top for overall quality and crystal clear optics. Think difference between regular TV and HDTV. Next would be Sightron which is not as bright or clear as the Zeiss but is slightly better than the Leupold. The Leupold is still a fine scope but I believe Sightron beats it on value and the Zeiss on overall image and build quality.
Like I said, I haven't compared it to the new VXIII's and Leupold was suppose to make improvements to image, build and funtional quality with that series.
I don't think you can go wrong either way but the Zeiss image/brightness quality will spoil you.