I have owned or used (in the field) all of your options except the ProStaff.
The two best optically are the Razor 65 and Zeiss. The Razor does perform similarly to the 85, IME (save for the lack of magnification). The Zeiss is short on eye relief and doesn't control CA quite as well as the Razor, but has an awesome build quality and very nice optics.
The Leupy is good optically and has phenomenal eye relief. It is also really compact and light for a 60mm spotter.
I owned the ED50 and currently have the Razor 50, and I prefer the Razor for the dual focus and aluminum build/ armor. Optically they are a wash, IMO. If you are going for a 50, the Razor 50 is a great choice.
For hunting the Leupy, Zeiss, and Razor 65 are all great options, with the Razor being my personal favorite of the bunch (and it comes in angled if you desire).