VX-II has MC4 coating on all surfaces, it's the same as the old Vari-X III.
Take a look at the Laupold package and the product number it has on it, if it begins with 56 or 57 it's one of the newer (since 2004) VX-IIs with all MC4 coatings (=92% transmission). If 53... or 54... it has single layer coatings and MC4 on ocular and objective lens only, 86% transmission.
Nikon Monarchs are fine, too.
The Conquest has an etched reticle, nice thing to have vs. the wire reticles, IMHo it has the brightest optics of all of them.
Bushnell 3200 and 4200 are fine, produced in Japan by LOW (like Nightforce, Nikon (only 50 objective diameter and upwards)). I think they have not enough eye relief and the Bushnell brand destroys resale value.
Nikon Buckmasters have 88% light transmission, I'd stay away from them - except for one model, the 4-12x50 SF, parallax adjustment by side focus and 92% light transmission, entirely different from other Buckmaster scopes.
So I'd suggest
1. 4-12x50 SF Nikon Buckmaster (92% transmission)
2. Nikon Monarch (95%)
3. new VX-II, product code beginning with 56 or 57 (92%)
3b. used vari-X III (92%)
4. Zeiss Conquest (95%)
5. VX-III (95%)
The Nikons have several advantages over Leupold: quick focus eyepiece and finger adjustable knobs vs. Leupold's coin slots.
Parallax adjustment side focus is a very nice thing to have! Have it myself on the Nikon 2.5-10x56 Monarch Gold which is one of the best scopes in the world (right on par with the Zeiss Diavari, Schmidt & Bender, Swarovski and better than Kahles).